Re: Disc Compatibility?

AMuzi <am@yellowjersey.org> wrote:

On 3/5/2025 2:08 PM, cyclintom wrote:

On Wed Mar 5 14:03:27 2025 AMuzi  wrote:

On 3/5/2025 10:49 AM, cyclintom wrote:

On Tue Mar 4 23:43:26 2025 AMuzi  wrote:

On 3/4/2025 2:16 PM, cyclintom wrote:

Andrew, I have GRX levers and Ultegra  actuators. It acts as if
these are not compatible. The levers on both front and rear will not
"pump" the brake pades close enough to the discs so that they
actuate with almost no pull. Instead they pull almost all of the way to the bar.
 
The pads are hardly worn and there are no leaks from the connections.

 
Shimano says yes, compatible. See page C-499 here:
 
https://productinfo.shimano.com/pdfs/product/archive/2023-2024_Compatibility_v030_en.pdf

 
 
 
 
That's a little hard to understand but it appears that all of the
actuators are the same compatibilitywise.

 
They are not.
 
Changing a flat bar Deore disc bike to road levers means new
calipers, for example.

 
 
 
 
It showed that the GRX gravel 10 speed was compatible with the Ultegra
11 speed actuator.Should I have looked deeper?

 
Right, that's what you asked and Shimano says 'compatible'.
 
Then Mr Merriman suggested, "all of the actuators are the
same compatibilitywise."  That's not true. The road models
as a group differ from the flat bar models as a group.
 
 

Deore is a MTB not road groupset might get used on Hybrids/flat bar road
bikes or flat bar Gravel bikes aka Hybrids but it’s still a MTB groupset
and yes not compatible, With road groupsets, I believe some of the
callipers gaining features such as wider gap so disks are quieter etc.

which is definitely annoying my my case as my Gravel bike and MTB have very
similar calipers and thus pads which are slightly different!

Though 10 speed cassettes etc are compatible I have same cassettes on the
Gravel/MTB with a 11-36 10 speed Deore.

Roger Merriman