The Pinarello brake upgrades are finished.
XTR M9200 XC levers
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M9200 post mount caliper and TRP front flat mount to post mount adapter
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MT805 rear flat mount rear caliper directly mounted, new BH90 hose.
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I'm not a big fan of adapters, but the TRP was the cleanest looking one that I could find. Much nicer than the Shimano. Replacing the Promax hoses was pretty straightforward. I used the Park IR kit to attach them together and push the new hoses through the frame.
Part of this upgrade was to swap the 100mm stem for a 110mm stem, based on my fit. That meant that I had to remove the headlight wiring. One wire goes to the TQ Smartbox inside the top tube, but the other wire goes to either the motor or the battery. I wanted to avoid removing either the motor or battery, so I had to find another way. I used a pull wire when I removed the headlight. The wire was connected in the motor area using two PresLok connectors. I clipped the connectors off and used the headlight wire to fish a piece of hookup wire back through for the reverse pull. The pull wire has to go through the new stem and TICR headset before entering the frame. After feeding it through, the headlight wire kept getting hung up, probably on a battery mount. It eventually broke as I tried to finesse it around the obstacle. At that point, I wanted to give it one more shot before dropping the motor. I used a piece of bailing wire to make a straight fish wire, which went past the obstacle on the first try. I fished it back and reconnected it to the supply with two new PresLoks.
You might remember that I had a lot of trouble with the headset not seating correctly and loosening up while riding. The Promax brake hoses were either not the right size or not installed correctly, even after I reconfigured them. The new BH90 hoses were no problem. TICR is always tricky to configure, but once I got the hoses and wiring in place and the tension correct, adjusting the headset was easy.
Filling and bleeding both brakes was also easy. I used the standard Shimano style lever cup and single syringe method, both part of a generic Amazon CYCOBYCO bleed kit. The syringes in that kit are high quality and come with replacement o-rings. It took about 8 passes for each brake to get all of the air out. Tapping the brake calipers, levers, and exposed hoses got the last of it.
On the stand, they feel strong and firm with no squish. Of course, the real test will be on the road, which might be a while since we have yet another Nor'easter coming tomorrow and Monday. I really like the lever throw adjustment on the XTR levers. I could easily balance the lever pulls to be equal.
You might have noticed that I swapped the 45mm Gravel King X1+ tires for 40mm. The 45mm only had about 3mm of fender clearance on the rear, which is too tight for comfort. The 40mm have about 10mm. No issues there.