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/