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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: RE: Re: RE: Re: Disc Compatibility?
Date: Wed, 5 Mar 2025 14:25:21 -0600
Organization: Yellow Jersey, Ltd.
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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.


-- 
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971