K4m1k4z3 wrote: ↑Tue Mar 26, 2024 6:46 pm
I just received the DA titanium clamps. Do you recall if you used the silver (Ultegra) or black (Dura-Ace) hollow bolt? (The main hex 5 one.)
I've got R8170 levers. Swapped the clamps over and used the black DA hollow bolts. They were a bit harder to push through the shifter body than the original silver Ultegra ones. I can spin them and tighten them no problem, just that there's a bit of resistance noticeable.
I'm not who you quoted but I've messed around with DA clamp bands to get them to work for various Shimano shifters using Shimano Dura-Ace, Ultegra, and Risk Titanium parts.
Basically as the parts get lighter the fixing bolt (attached to the clamp band) and receptacle part (attached through the shifter) both get shorter. What you likely experienced is that the shorter DA fixing bolt is harder to poke through the shifter body due to being shorter.
I have yet to run into a situation where having longer parts than required cause issues other than higher weight.
From what I've seen there are more weight savings to be had in the receptacle part attached through the shifter.
With Di2 rim ST-R9250 I decided to use the Dura-Ace fixing bolt for more length and the Risk receptacle part and washer.
With Di2 hydro ST-R8170 I decided to use the Dura-Ace fixing bolt for more length and the Risk receptacle part and washer.
With one of these shifter sets it was basically impossible to use only the Risk parts where for the other it was harder than desired but worked but I went with something that worked with no issues to reduce risk. However, I can't recall which one had more issues. So keep in mind that the various Di2, mechanical, hydro, and rim shifters likely have slightly different minimum bolt length requirements to get acceptable thread engagement.
As far as I can tell the Shimano titanium clamp bands are the same between all their Dura-Ace shifters. I've checked ST-R9100, ST-R9170, and ST-R9250 so far. Shimano has tons of different SKUs with different bolts for the different shifter sets though.
Photos I captured:
Copied from a previous post of mine:
The stock shifter clamp assemblies for Ultegra are 34.30g (19.52g for two steel bands, 6.66g for two bolts, 2*0.99g for washers, 2*3.07g for nuts)
Dura-Ace shifter clamp assemblies are 21.77g (10.09g for two ti bands, 3.90g for two bolts, 2*0.95g for washers, 2*2.94g for nuts)
My modified Dura-Ace shifter clamp assemblies are 16.99g (10.09g for two Dura-Ace Ti bands and 6.90g for two aftermarket Ti bolts, washers, and nuts)