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Does anyone know PM-PM-F/R203 adapters



 
 
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  #1  
Old October 19th 17, 12:41 AM posted to rec.bicycles.tech
Joerg[_2_]
external usenet poster
 
Posts: 4,623
Default Does anyone know PM-PM-F/R203 adapters

Attention, a purely technical post :-)

Does anyone know whether these adapters are for going from 160mm native
post mount to 203mm rotors?

https://erpimgs.idealhere.com/ImageF...963c864243.jpg

The bellied version (which I'd need) seems to only be available from
Chinese sellers and they either don't understand English or plain don't
know what they are selling. Or both. For example, when I asked the
either-or question whether the adapter is for 160mm to 203mm or for
180mm to 203mm the answer was "No". Refining the question in great
detail resulted in "It's for 203mm". Needless to say, asking for
dimensions so I can calculate it myself is generally fruitless as well.

--
Regards, Joerg

http://www.analogconsultants.com/
Ads
  #2  
Old October 19th 17, 07:47 PM posted to rec.bicycles.tech
[email protected]
external usenet poster
 
Posts: 3,346
Default Does anyone know PM-PM-F/R203 adapters

On Wednesday, October 18, 2017 at 4:41:15 PM UTC-7, Joerg wrote:
Attention, a purely technical post :-)

Does anyone know whether these adapters are for going from 160mm native
post mount to 203mm rotors?

https://erpimgs.idealhere.com/ImageF...963c864243.jpg

The bellied version (which I'd need) seems to only be available from
Chinese sellers and they either don't understand English or plain don't
know what they are selling. Or both. For example, when I asked the
either-or question whether the adapter is for 160mm to 203mm or for
180mm to 203mm the answer was "No". Refining the question in great
detail resulted in "It's for 203mm". Needless to say, asking for
dimensions so I can calculate it myself is generally fruitless as well.


The Avid disks are 206's I believe. I placed these adapters on the standard mounts of my Redline and they work perfectly.
  #3  
Old October 19th 17, 08:28 PM posted to rec.bicycles.tech
Joerg[_2_]
external usenet poster
 
Posts: 4,623
Default Does anyone know PM-PM-F/R203 adapters

On 2017-10-19 11:47, wrote:
On Wednesday, October 18, 2017 at 4:41:15 PM UTC-7, Joerg wrote:
Attention, a purely technical post :-)

Does anyone know whether these adapters are for going from 160mm
native post mount to 203mm rotors?

https://erpimgs.idealhere.com/ImageF...963c864243.jpg



The bellied version (which I'd need) seems to only be available from
Chinese sellers and they either don't understand English or plain
don't know what they are selling. Or both. For example, when I
asked the either-or question whether the adapter is for 160mm to
203mm or for 180mm to 203mm the answer was "No". Refining the
question in great detail resulted in "It's for 203mm". Needless to
say, asking for dimensions so I can calculate it myself is
generally fruitless as well.


The Avid disks are 206's I believe. I placed these adapters on the
standard mounts of my Redline and they work perfectly.


You mean you used those PM-PM-F/R203 adapters in the image link above?
Does the Redline have 160mm native posts?

That would be perfect, then they would also work on my MTB. I'd like to
use them for both wheels since both are native 160mm PM for the caliper
mounts. With brake rotors bigger is better.

Slight errors can be fixed by adding washers. If slightly negative my
MTB buddy could grind off a smidgen since he is a tool & die maker and
has machines.

--
Regards, Joerg

http://www.analogconsultants.com/
  #4  
Old October 20th 17, 05:13 PM posted to rec.bicycles.tech
[email protected]
external usenet poster
 
Posts: 3,346
Default Does anyone know PM-PM-F/R203 adapters

On Thursday, October 19, 2017 at 12:27:58 PM UTC-7, Joerg wrote:
On 2017-10-19 11:47, wrote:
On Wednesday, October 18, 2017 at 4:41:15 PM UTC-7, Joerg wrote:
Attention, a purely technical post :-)

Does anyone know whether these adapters are for going from 160mm
native post mount to 203mm rotors?

https://erpimgs.idealhere.com/ImageF...963c864243.jpg



The bellied version (which I'd need) seems to only be available from
Chinese sellers and they either don't understand English or plain
don't know what they are selling. Or both. For example, when I
asked the either-or question whether the adapter is for 160mm to
203mm or for 180mm to 203mm the answer was "No". Refining the
question in great detail resulted in "It's for 203mm". Needless to
say, asking for dimensions so I can calculate it myself is
generally fruitless as well.


The Avid disks are 206's I believe. I placed these adapters on the
standard mounts of my Redline and they work perfectly.


You mean you used those PM-PM-F/R203 adapters in the image link above?
Does the Redline have 160mm native posts?

That would be perfect, then they would also work on my MTB. I'd like to
use them for both wheels since both are native 160mm PM for the caliper
mounts. With brake rotors bigger is better.

Slight errors can be fixed by adding washers. If slightly negative my
MTB buddy could grind off a smidgen since he is a tool & die maker and
has machines.


I didn't pay attention to what the original disk size was supposed to be. The Avids wouldn't fit and I bought the adapters which LOOK just like the one's in your picture and the disks are 206 mm as an approximate estimate with something like 3 3/4 radius using a hand held tape measure.

I bought the hydraulic actuation because the reports on the manual disks was universally bad.
  #5  
Old October 20th 17, 07:09 PM posted to rec.bicycles.tech
Joerg[_2_]
external usenet poster
 
Posts: 4,623
Default Does anyone know PM-PM-F/R203 adapters

On 2017-10-20 09:13, wrote:
On Thursday, October 19, 2017 at 12:27:58 PM UTC-7, Joerg wrote:
On 2017-10-19 11:47,
wrote:
On Wednesday, October 18, 2017 at 4:41:15 PM UTC-7, Joerg wrote:
Attention, a purely technical post :-)

Does anyone know whether these adapters are for going from
160mm native post mount to 203mm rotors?

https://erpimgs.idealhere.com/ImageF...963c864243.jpg





The bellied version (which I'd need) seems to only be available from
Chinese sellers and they either don't understand English or
plain don't know what they are selling. Or both. For example,
when I asked the either-or question whether the adapter is for
160mm to 203mm or for 180mm to 203mm the answer was "No".
Refining the question in great detail resulted in "It's for
203mm". Needless to say, asking for dimensions so I can
calculate it myself is generally fruitless as well.

The Avid disks are 206's I believe. I placed these adapters on
the standard mounts of my Redline and they work perfectly.


You mean you used those PM-PM-F/R203 adapters in the image link
above? Does the Redline have 160mm native posts?

That would be perfect, then they would also work on my MTB. I'd
like to use them for both wheels since both are native 160mm PM for
the caliper mounts. With brake rotors bigger is better.

Slight errors can be fixed by adding washers. If slightly negative
my MTB buddy could grind off a smidgen since he is a tool & die
maker and has machines.


I didn't pay attention to what the original disk size was supposed to
be.



Looks like now they only have bikes for kids :-)

http://redlinebicycles.com/

You and I are too old for BMX so I assume you have a CX or road bike
from them and those are usually 160mm native.


The Avids wouldn't fit and I bought the adapters which LOOK just
like the one's in your picture and the disks are 206 mm as an
approximate estimate with something like 3 3/4 radius using a hand
held tape measure.


Well, then I'll order two of those.


I bought the hydraulic actuation because the reports on the manual
disks was universally bad.


Hydraulic is clearly better. Some mechanical disc brakes are ok if the
rotors are larger, 7- or 8-inch.

--
Regards, Joerg

http://www.analogconsultants.com/
  #6  
Old October 20th 17, 08:33 PM posted to rec.bicycles.tech
AMuzi
external usenet poster
 
Posts: 9,030
Default Does anyone know PM-PM-F/R203 adapters

On 10/20/2017 1:09 PM, Joerg wrote:
On 2017-10-20 09:13, wrote:
On Thursday, October 19, 2017 at 12:27:58 PM UTC-7, Joerg
wrote:
On 2017-10-19 11:47,
wrote:
On Wednesday, October 18, 2017 at 4:41:15 PM UTC-7,
Joerg wrote:
Attention, a purely technical post :-)

Does anyone know whether these adapters are for going from
160mm native post mount to 203mm rotors?

https://erpimgs.idealhere.com/ImageF...963c864243.jpg






The bellied version (which I'd need) seems to only be
available from
Chinese sellers and they either don't understand
English or
plain don't know what they are selling. Or both. For
example,
when I asked the either-or question whether the adapter
is for
160mm to 203mm or for 180mm to 203mm the answer was "No".
Refining the question in great detail resulted in "It's
for
203mm". Needless to say, asking for dimensions so I can
calculate it myself is generally fruitless as well.

The Avid disks are 206's I believe. I placed these
adapters on
the standard mounts of my Redline and they work perfectly.


You mean you used those PM-PM-F/R203 adapters in the
image link
above? Does the Redline have 160mm native posts?

That would be perfect, then they would also work on my
MTB. I'd
like to use them for both wheels since both are native
160mm PM for
the caliper mounts. With brake rotors bigger is better.

Slight errors can be fixed by adding washers. If slightly
negative
my MTB buddy could grind off a smidgen since he is a tool
& die
maker and has machines.


I didn't pay attention to what the original disk size was
supposed to
be.



Looks like now they only have bikes for kids :-)

http://redlinebicycles.com/

You and I are too old for BMX so I assume you have a CX or
road bike from them and those are usually 160mm native.


The Avids wouldn't fit and I bought the adapters which
LOOK just
like the one's in your picture and the disks are 206 mm as an
approximate estimate with something like 3 3/4 radius
using a hand
held tape measure.


Well, then I'll order two of those.


I bought the hydraulic actuation because the reports on
the manual
disks was universally bad.


Hydraulic is clearly better. Some mechanical disc brakes are
ok if the rotors are larger, 7- or 8-inch.



"bikes for kids"
??

https://www.youtube.com/watch?v=UzS2G-TBhX4&t=188s

Desmond Rhodes? Mike Escamilla?

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


  #7  
Old October 20th 17, 10:18 PM posted to rec.bicycles.tech
Joerg[_2_]
external usenet poster
 
Posts: 4,623
Default Does anyone know PM-PM-F/R203 adapters

On 2017-10-20 12:33, AMuzi wrote:
On 10/20/2017 1:09 PM, Joerg wrote:
On 2017-10-20 09:13, wrote:
On Thursday, October 19, 2017 at 12:27:58 PM UTC-7, Joerg
wrote:
On 2017-10-19 11:47,
wrote:
On Wednesday, October 18, 2017 at 4:41:15 PM UTC-7,
Joerg wrote:
Attention, a purely technical post :-)

Does anyone know whether these adapters are for going from
160mm native post mount to 203mm rotors?

https://erpimgs.idealhere.com/ImageF...963c864243.jpg







The bellied version (which I'd need) seems to only be
available from
Chinese sellers and they either don't understand
English or
plain don't know what they are selling. Or both. For
example,
when I asked the either-or question whether the adapter
is for
160mm to 203mm or for 180mm to 203mm the answer was "No".
Refining the question in great detail resulted in "It's
for
203mm". Needless to say, asking for dimensions so I can
calculate it myself is generally fruitless as well.

The Avid disks are 206's I believe. I placed these
adapters on
the standard mounts of my Redline and they work perfectly.


You mean you used those PM-PM-F/R203 adapters in the
image link
above? Does the Redline have 160mm native posts?

That would be perfect, then they would also work on my
MTB. I'd
like to use them for both wheels since both are native
160mm PM for
the caliper mounts. With brake rotors bigger is better.

Slight errors can be fixed by adding washers. If slightly
negative
my MTB buddy could grind off a smidgen since he is a tool
& die
maker and has machines.

I didn't pay attention to what the original disk size was
supposed to
be.



Looks like now they only have bikes for kids :-)

http://redlinebicycles.com/

You and I are too old for BMX so I assume you have a CX or
road bike from them and those are usually 160mm native.


The Avids wouldn't fit and I bought the adapters which
LOOK just
like the one's in your picture and the disks are 206 mm as an
approximate estimate with something like 3 3/4 radius
using a hand
held tape measure.


Well, then I'll order two of those.


I bought the hydraulic actuation because the reports on
the manual
disks was universally bad.


Hydraulic is clearly better. Some mechanical disc brakes are
ok if the rotors are larger, 7- or 8-inch.



"bikes for kids"
??

https://www.youtube.com/watch?v=UzS2G-TBhX4&t=188s

Desmond Rhodes? Mike Escamilla?


Once over 50 then every rider under 40 is like a kid :-)

--
Regards, Joerg

http://www.analogconsultants.com/
  #8  
Old November 11th 17, 01:48 AM posted to rec.bicycles.tech
Joerg[_2_]
external usenet poster
 
Posts: 4,623
Default Does anyone know PM-PM-F/R203 adapters

On 2017-10-18 16:41, Joerg wrote:
Attention, a purely technical post :-)

Does anyone know whether these adapters are for going from 160mm native
post mount to 203mm rotors?

https://erpimgs.idealhere.com/ImageF...963c864243.jpg


The bellied version (which I'd need) seems to only be available from
Chinese sellers and they either don't understand English or plain don't
know what they are selling. Or both. For example, when I asked the
either-or question whether the adapter is for 160mm to 203mm or for
180mm to 203mm the answer was "No". Refining the question in great
detail resulted in "It's for 203mm". Needless to say, asking for
dimensions so I can calculate it myself is generally fruitless as well.


So, I just dunnit. The front and back wheels of the MTB now both have 8"
or 203mm rotors. Shimano SM-RT66 (SLX Deore) for now, long term I'll be
looking for solid rotors.

Other than the usual swap dance of washers for shimming until it was
just right it was a painless switch. Braking feels nice and sturdy.

Shimano recommends 18 to 35 in-lbs of torque for the rotor bolts. Seems
wimpy and the previous ones sat way tighter, so I gave it a bit more oomph.

While at it I adjusted out the rattle and play that always develops in
the steerer after a few hundred trail miles. Every time I torque down
those tiny stem bolts at the spec'd 44 in-lbs it feels like they'll
strip the threads out any second.

--
Regards, Joerg

http://www.analogconsultants.com/
  #9  
Old November 11th 17, 04:51 PM posted to rec.bicycles.tech
JBeattie
external usenet poster
 
Posts: 2,768
Default Does anyone know PM-PM-F/R203 adapters

On Friday, November 10, 2017 at 4:47:56 PM UTC-8, Joerg wrote:
On 2017-10-18 16:41, Joerg wrote:
Attention, a purely technical post :-)

Does anyone know whether these adapters are for going from 160mm native
post mount to 203mm rotors?

https://erpimgs.idealhere.com/ImageF...963c864243.jpg


The bellied version (which I'd need) seems to only be available from
Chinese sellers and they either don't understand English or plain don't
know what they are selling. Or both. For example, when I asked the
either-or question whether the adapter is for 160mm to 203mm or for
180mm to 203mm the answer was "No". Refining the question in great
detail resulted in "It's for 203mm". Needless to say, asking for
dimensions so I can calculate it myself is generally fruitless as well.


So, I just dunnit. The front and back wheels of the MTB now both have 8"
or 203mm rotors. Shimano SM-RT66 (SLX Deore) for now, long term I'll be
looking for solid rotors.

Other than the usual swap dance of washers for shimming until it was
just right it was a painless switch. Braking feels nice and sturdy.

Shimano recommends 18 to 35 in-lbs of torque for the rotor bolts. Seems
wimpy and the previous ones sat way tighter, so I gave it a bit more oomph.

While at it I adjusted out the rattle and play that always develops in
the steerer after a few hundred trail miles. Every time I torque down
those tiny stem bolts at the spec'd 44 in-lbs it feels like they'll
strip the threads out any second.


Shimano has tightening plates on their six-bolt rotors. Avid uses a higher torque spec. 5nm should be plenty to keep your stem and headset tight, but probably not in Cameron Park.

- Jay Beattie.
  #10  
Old November 11th 17, 07:39 PM posted to rec.bicycles.tech
Joerg[_2_]
external usenet poster
 
Posts: 4,623
Default Does anyone know PM-PM-F/R203 adapters

On 2017-11-11 07:51, jbeattie wrote:
On Friday, November 10, 2017 at 4:47:56 PM UTC-8, Joerg wrote:
On 2017-10-18 16:41, Joerg wrote:
Attention, a purely technical post :-)

Does anyone know whether these adapters are for going from 160mm
native post mount to 203mm rotors?

https://erpimgs.idealhere.com/ImageF...963c864243.jpg




The bellied version (which I'd need) seems to only be available from
Chinese sellers and they either don't understand English or plain
don't know what they are selling. Or both. For example, when I
asked the either-or question whether the adapter is for 160mm to
203mm or for 180mm to 203mm the answer was "No". Refining the
question in great detail resulted in "It's for 203mm". Needless
to say, asking for dimensions so I can calculate it myself is
generally fruitless as well.


So, I just dunnit. The front and back wheels of the MTB now both
have 8" or 203mm rotors. Shimano SM-RT66 (SLX Deore) for now, long
term I'll be looking for solid rotors.

Other than the usual swap dance of washers for shimming until it
was just right it was a painless switch. Braking feels nice and
sturdy.

Shimano recommends 18 to 35 in-lbs of torque for the rotor bolts.
Seems wimpy and the previous ones sat way tighter, so I gave it a
bit more oomph.

While at it I adjusted out the rattle and play that always develops
in the steerer after a few hundred trail miles. Every time I torque
down those tiny stem bolts at the spec'd 44 in-lbs it feels like
they'll strip the threads out any second.


Shimano has tightening plates on their six-bolt rotors.



All those little things are is a tiny locking lip sticking up for each
screw, pair-wise. That won't hold much. One of the issues with low
torque is the rotor slacking back and forth if you have to hold the bike
from rolling back down a hill, then downhill again, then up, and so on.
Which happens a lot on an MTB. For some reason the manufacturers can't
get the tolerancing in the screws and holes tight enough.


... Avid uses a
higher torque spec. 5nm should be plenty to keep your stem and
headset tight, but probably not in Cameron Park.


It does but only if I smear some grit-laden toothpaste on the fork tube
before sliding on the stem. Not the paste for electric brushing but the
regular paste. What I am saying is that 5nm feels like it's about to
strip the aluminum threads out.

--
Regards, Joerg

http://www.analogconsultants.com/
 




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