Caliper Brake mounting and thick Carbon forks

[BRad704]

So I'm mounting up some new R8000 calipers on my 2014 Madone, and the included recessed caliper mounting nuts are WAY too short, both front and rear.

I have a stache of mounting nuts here, so I've got the rear sorted... but WHERE besides ONE eBay seller can I find a 40mm (~35-36mm shaft) caliper mounting nut??

Currently I've robbed the nut from a different bike, but that's less than ideal, since I want to ride both bikes without moving critical parts around everytime.



While I'm venting a little... this is why I LOVED my local Coop in the past, and why I HATE what it has become this year. Basically our Coop lost some state grant funding and decided it had to turn profit or close. I get that, takes money to pay the staff, rent, etc. But they L I T E R A L L Y threw away probably 1,000 pounds of old bike parts, vintage frames, shifters, chainrings, and racks and rack and racks of mounting bolts like this. Not to mention trashing an ENTIRE stand-up cabinet of NOS spokes. It used to be heaven for me to walk in there with a vintage bike need, and walk out with $15 spent on some rare but necessary stuff. Now it's all beat-to-hell 9 and 10 speed parts being sold (or trying to be sold) for near-retail prices. It's a damn shame because now it's just a *****ty version of an LBS.

[jtbadge]

Your LBS probably has a drawer full of these, many new brakes come with multiple nuts and most forks only need the shortest length.

[homagesilkhope]

I thought I needed one of those for a new-to-me Colnago EPS (thanks, Matthew) a couple of years ago. Figure I stopped at 10 different shops local to me looking for a 40mm nut but no dice. In the end I discovered that a tight fit/new-ish paint was keeping the nut from recessing far enough inside the fork crown to reach the initial threads of the caliper. (The "seat" for the nut is recessed more than I expected, much deeper inside the fork crown than in the case of my EP, for example.) Once firmly pressed in a bit, the supplied 36mm - as I recall - nut did the trick. But, yeah, 40mm nuts are hard to come by.

[BRad704]

Originally Posted by jtbadge

Your LBS probably has a drawer full of these, many new brakes come with multiple nuts and most forks only need the shortest length.

Good thought, but my main LBS only had a few in a bin up to 30mm max. Will check some other shops this weekend.

Originally Posted by homagesilkhope

I thought I needed one of those for a new-to-me Colnago EPS (thanks, Matthew) a couple of years ago. Figure I stopped at 10 different shops local to me looking for a 40mm nut but no dice. In the end I discovered that a tight fit/new-ish paint was keeping the nut from recessing far enough inside the fork crown to reach the initial threads of the caliper. (The "seat" for the nut is recessed more than I expected, much deeper inside the fork crown than in the case of my EP, for example.) Once firmly pressed in a bit, the supplied 36mm - as I recall - nut did the trick. But, yeah, 40mm nuts are hard to come by.

Yeah it's kinda crazy to me that modern groupsets on somewhat modern bikes don't have any provisions for anything longer than what they feel is the typical size.

[mhespenheide]

https://www.ebay.com/itm/113903350233

40mm on eBay?

[BRad704]

Originally Posted by mhespenheide

https://www.ebay.com/itm/113903350233

40mm on eBay?

Yep. That’s exactly the one i ended up ordering earlier today.

[prototoast]

Originally Posted by BRad704

Good thought, but my main LBS only had a few in a bin up to 30mm max. Will check some other shops this weekend.


Yeah it's kinda crazy to me that modern groupsets on somewhat modern bikes don't have any provisions for anything longer than what they feel is the typical size.

It's even worse with flat mount bolts.

[Applesauce]

Originally Posted by prototoast

It's even worse with flat mount bolts.

This. What a crap system.