I heard some bad stuff about the Tektro performance yesterday at my race. It was from an AR owner's son...might even be one of you...
I have a T750 on my AR1 and have been pleased with the performance. It isn't as "grippy" as the DA9000 front but it can lock up the rear wheel with one finger on the lever and that's more than adequate for me. I'm using Jagwire linkage housing to reduce compression for a crisper feel at the lever.
I would love to have more detail to make it work. Di you used the Jagwire Road Elite Link housing? Also, did you used a flexible noodle? At last, did your caliper look like this one... This is what Tektro directly ship to me as a T750R caliper.
Thanks, I would love to love my bike again...
I was meticulous with the preparation. You need to make sure the inner wire has no kinks or bends. I use the DA9000 inner wire but I think the PTFE coated cables are just as good in this application with the Elite Link housing. I did not use the flexible noodle as that would add compression and thus a softer lever feel as some of the initial stroke would be used to take out slack in the system, not move the caliper arms.
I have the same rear brake but I changed brake pads to a slightly longer and higher profile unit from Ashima.
The one thing I did custom was reduce the spring tension by removing the set screws and using a jewelers file to open the slot slightly reducing the spring tension further. High spring tension is only useful here when the cable housing is kinked or has to make many sharp bends, such as the inside of an internally routed aerobar on a TT bike. Tektro borrows the T925 bits to actuate the arms of the T750 and I think it is oversprung with DA9070 levers. After opening the spring stop slots I reinstall whichever set screw is needed to balance the spring tension. There is no need for both screws.