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Old October 20th 17, 10:18 PM posted to rec.bicycles.tech
Joerg[_2_]
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Posts: 6,016
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/
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