PierreLouis778

Hello guys ! I'm building a new bike to travel across France this summer but sadly I encountered my first of I believe many problem of building my own bike. I ordered Shimano tiagra 4770 disc brake but the front one doesn't fit on my fork. To explain it more I have the 160mm adapter that was delivered with the brake caliper (it is flat mount) but holes in the fork are like 5-10mm wider than the holes on the adapter which means that when I fit the upper screw, the hole in the adapter and in the fork don't match and I can't fix the other one. My fork and frame are from the brand cinelli and the model is called ZYDECO. It looks like it's the version from 2014 I believe.

And for the rear disc brake caliper I also have a problem. The fixation isn't located on the inside of the frame but on the outside. I ordered an adapter but I am pretty sure it will not fit properly as I got the frame in hand.

Do you guys have any information or advises for me please?

I will provide picture if you guys need them to help me just tell me what you need.

Thanks in advance
Pierre-louis

dsaul

Your frame and fork are "post mount" not "flat mount". This is the only company making an adapter for fitting flat mount brakes to a post mount frame/fork. https://www.assolutions.ca/shop/adap...ith-160-rotor/ Another option is purchasing a pair of inexpensive Post mount calipers like the Deore MTB brake calipers and use those in place of the Tiagra calipers.

PierreLouis778

I found that when it was sold in 2015 they used those brakes Shimano BR-R317 maybe that could help ?

tyrion

Those are post mount brakes.

https://bike.shimano.com/en-EU/produ...0/BR-R317.html

dedhed

That'll happen when you order things without the frame in hand.

dsaul

The BR-R317 is a mechanical(cable operated) brake. The 4770 is a hydraulic brake and they are not compatible. You need to find a post mount hydraulic caliper that uses the BH90 hose like the Tiagra does.