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After taking my wheel off a couple weeks ago for a broken spoke I noticed a strange wear pattern on my rotor. Guys at the shop noticed it too – apparently my pads have been just barely grabbing onto the rotor (yikes!).
So what’s wrong here – do I need to try a different adapter? Or can I take washers out of the bolt stack? Or maybe I need a larger rotor?
If it helps, I’m running a 160mm rotor (which is a standard build option) and the adapter I’m using is labeled "40mm." Pics attached.
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You don’t want to remove washers, as that’s Avid’s super doozy method of aligning the caliper to the rotor properly. You need to purchase an adaptor to match your rotor size.
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[quote="trek7k"] Guys at the shop noticed it too
The guys at the shop didnt have any suggestions???I think you have too many spacers under the caliper bracket.I think you can take the lower one’s out and so the upper washer’s are the adjuster cup/spacers that align the rotor to the pads.
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the two cupped washers both above and below the caliper are supposed to be there. If you take them away from either side, either the face of the spacer or the bolt head will force the caliper to conform to that plane. The cups on both sides allow the caliper to rotate to whatever angle is needed.
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$10 says you are using a Hayes rear brake adaptor rather than an Avid rear brake adaptor. The Hayes adaptor will make your Avid brakes sit about 4-5 mm higher up because they are not designed for the CPS washers that Avid uses to align their calipers. I’ve got the same thing going on with that grey Fuel that Greg rode up in Chattanooga. You can pull the CPS bolts but it’s still wonky.
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Yeah, I don’t wanna mess with the CPS bolt stack because that’s the magic that makes the Avids so easy to install/align. It’s possible I have a Hayes adapter on there but I’m pretty sure I installed the one that came with the Elixirs.
Guys at the shop suggested slapping a larger rotor on there (165mm) but I was hoping I could find a solution using parts I already have.
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Adaptor is on backwards maybe?
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Yes! That seems very plausible. 😀 Will try flipping and will report back.
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I had this issue when I had the adapter backwards, but in my case it engaged the rotor at an angle.
Yours looks like maybe the adapter is for a 180mm rotor where you’re actually using a 160mm.
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Ok Dustin, that wasn’t it. Flipping the adapter wasn’t even close – I was sure that was going to work!
I found another adapter floating around my parts bin (I think it’s from a set of XT brakes) and that did the trick! I think a 165mm rotor also would have worked with the original adapter (mechanic’s recommendo) but that size rotor is kinda hard to find. Slapped a new set of pads in and I’m good to go. Thanks guys!
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I think you might be right Corey – a 165mm rotor wouldn’t get me much more coverage (it’s an extra 5mm but that’s the diameter which means just 2.5mm more engagement). I actually held up a 180mm rotor before swapping adapters and it looked like it might’ve fit.
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So for the record, the shop was stumped and #singletracks figured it out? 😎
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"maddslacker" wrote
So for the record, the shop was stumped and #singletracks figured it out? 😎
Yeah, but that’s not sayin’ much. 😀 My (current) LBS is less than a mile from my house and I ride MTB with several of the guys regularly – great guys. Problem is, they’re a small shop and mainly cater to the local market which is road, triathlon, and commuter. Case in point: it recently took them two weeks to replace a spoke because they didn’t have any Stan’s tape and had to order it.
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"trek7k" wrote
Yeah, but that’s not sayin’ much. 😀 My (current) LBS is less than a mile from my house and I ride MTB with several of the guys regularly – great guys. Problem is, they’re a small shop and mainly cater to the local market which is road, triathlon, and commuter. Case in point: it recently took them two weeks to replace a spoke because they didn’t have any Stan’s tape and had to order it.
2 weeks?? Next time just give me a call. I have like 20 yards of that stuff in my garage. REI also has it for about $10.
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Amazon has it too, with free 2-day shipping for Prime members. 😃
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Yes, thanks guys – I’m aware the stuff is readily available. That’s what makes the situation ridiculous. 😀
But hey, now my LBS has a whole roll of tape and I’m probably the only guy who’ll need it so they’ll have it for me next time. 😆
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Gorrila tape. Available pretty much everywhere, tons of uses.
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Speaking of Gorilla tape, last week my daughter fell onto a yucca plant and it put a pinhole in the bladder of her hydration pack. Gorilla tape fixed it right up!
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wow, not much engagement at all.
how did you stop, fred flintstone method?
btw, if it were me i’d just pop for an avid adapter bracket. just thinking that the shimano may be better, but possibly not optimal either.
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