I have an older Twin6 Standard Rando frame with IS mounts and I’m about to buy some GRX flat mount brakes. Since I’m lacking literature on the older frame I have I’ve been using chat gpt for info. Chat GPT has led me to believe I can get adapters to mount these brakes. Now I’m having a hard time finding the actual adapter to fit. Should I avoid these brakes or is it likely there is an adapter. I saw the ASSolutions options but those are questionable if they will work.
by Right-Border-7019
3 Comments
Have you considered a Post-Mount brake? For example: [https://www.bike-discount.de/en/shimano-br-rs785-post-mount-brake-caliper](https://www.bike-discount.de/en/shimano-br-rs785-post-mount-brake-caliper)
Adapters from an IS frame to PM brake are easily available.
AS Solutions or use a post mount brake caliper. ISO to post adapters are reliable and easy to find and, to my understanding, GRX levers are compatible with Shimano mtb calipers.
[https://www.reddit.com/r/bikewrench/comments/195zktg/adapting_flat_mount_brakes_to_fit_is_mount_frame/](https://www.reddit.com/r/bikewrench/comments/195zktg/adapting_flat_mount_brakes_to_fit_is_mount_frame/) good info
For Shimano the MTB and road calipers are interchangeable, so using a mtb caliper with the road levers can be a good option. (wasn’t sure when you said you’re buying a brake if you meant just the caliper, or caliper plus levers)