Im installing a Shimano Cues caliper BR-U6030 on a Genesis Croix de Fer with a 160mm rotor and it looks like the pad is not contacting the rotor fully, shouldn't it make full contact?
by syrelyre
Im installing a Shimano Cues caliper BR-U6030 on a Genesis Croix de Fer with a 160mm rotor and it looks like the pad is not contacting the rotor fully, shouldn't it make full contact?
by syrelyre
6 Comments
Rotor/frame combo looks like it requires a 180mm.
Yes. The rotor should go completely into the caliper.
https://preview.redd.it/75as69wf5nsg1.jpeg?width=4032&format=pjpg&auto=webp&s=1d615c715572b15c60bd1ad07c3129ef9e9792b2
dumb question, but are you sure you’re using a rear brake? If I’m not mistaken, the Shimano Cues BR-U6030 have separate front and rear designs. It isn’t like some other calipers where have a universal caliper but need to change the bracket for front vs rear or different rotor sizes.
That caliper only goes in one place, and while it’s designed to run 160mm in the standard flat mount position, your frame appears to use a spacing that’s for a rotor that’s 20mm bigger. If you actually have a 160mm in there now you will need. 180mm rotor to make this work.
The cause of your issue is nomenclature. When flat mount was introduced, the front had one standard mounting dimension – the fork mounts were in a spot, there is an adapter bracket that goes from that wide bolt spacing you have, to the same bolt spacing as your rear caliper. If you put the spacer one way the caliper was closer to the hub & they called that 140mm because that’s the rotor that fit… flip it the other way the caliper sits farther from the hub & they called it 160mm because that’s the rotor that fit.
Then someone realized… we can make fork mounts farther out, so the “140mm” way fits 160mm rotors, and the “160mm” way fits 180mm rotors, because it’s not really 140mm vs 160mm, it’s really +0mm vs +20mm.
Then you have calipers like you have, that don’t use that flippable adapter, and… oh yeah, the “built in adapter” is in the dimensions of the “160mm” direction. So when you put that caliper on a native-160mm fork, you need a 180mm rotor.
You need a 180mm rotor. No adaptors needed
loosen mounting bolt and turn/adjust until pads are dead center of rotor