Márton Salomváry

Wanted to bleed my Shimano GRX brakes after 10,000 km and almost 3 years, first time since I bought the bike new (impressive low maintenance btw).

One of the reasons I had the bike built with Shimano disc brakes is the many years of experience I have maintaining SLX MTB brakes.

Naive me expected the bleeding kit to be compatible, in the end it's the same brand, same oil...

Sadly, the port is larger on the SLX for no apparent reason. No bleeding today, squishy brakes tomorrow.

#cycling #GRX

Dec 27 at 6:10pmWeb
Show threadMárton SalomváryDec 27

So I need to buy this adapter thingy.

Costs peanuts, but I truly wonder in what way is the wider bleeding port superior for road/gravel bikes to the narrow one on mountain bikes... Or did the engineers responsible for road and MTB at Shimano fail to talk to each other?

(Wondering because I consider Shimano to be a company that values compatibility...)

Show threadmarkn🚲Dec 27
@mrc I feel your pain. Walked this path & own the same adaptor. Also own boxes of non cross compatible MTB Vs Road Shimano gearing systems. Sigh...
Show threadDanielDec 28
They don't. If they did they wouldn't have changed the i-Spec three times, the pull-ratio on all the derailleurs would be identical for road and MTB groups, chainring mounts wouldn't have changed to asymmetrical, ...
SRAM is not better in this regard. The Transmission groups have a different sprocket spacing and are not backwards compatible to Eagle components.