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Discussion Starter · #1 · (Edited)
Hey y'all,

I finally installed the kool stop green pads on my SD-7's to brake on some Mavic Crossmax ceramic rims. The package says "Note: Mount Flat to Rim - tip to toe". So, I did that.

The back brake works great, but when I apply the front brake the front wheel shakes ever so slightly back and forth (you know, towards me and away from me [not side to side]). The fork is a good fork, a new Reba team and the headset is a Chris King all set up by a great shop. Did I not install the pads right? Or is the green pad gripping the ceramic rim so hard that it is continuously catching and releasing? Does this go away once the pads are broken in? Any help would be greatly appreciated.

One more thing, the wheel only shakes when riding at 2-3 mph. Any faster than that, and it doesn't seem to do it.

Bri
 

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If you toed them....

then yes it's likely that the pads are sort of grabbing and releasing at low speeds. This is because you typically don't apply the brakes hard enough at low speeds to flatten the pads against the rim. The pad starts to flatten out but there isn't enough force behind it to allow it to do so completely and it kind of skips. The rear is another story as it has more weight over it, most bikes have a slightly rearward weight bias.

If you did toe the brakes try re-adjusting them so they a flat against the rim. Most v-brakes typically don't need to be toed unless the they squeal when applied. I'm betting that will take care of your shudder.

Good Dirt
 

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ballbuster
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Mine do this too...

Polar Bear said:
Hey y'all,

I finally installed the kool stop green pads on my SD-7's to brake on some Mavic Crossmax ceramic rims. The package says "Note: Mount Flat to Rim - tip to toe". So, I did that.

The back brake works great, but when I apply the front brake the front wheel shakes ever so slightly back and forth (you know, towards me and away from me [not side to side]). The fork is a good fork, a new Reba team and the headset is a Chris King all set up by a great shop. Did I not install the pads right? Or is the green pad gripping the ceramic rim so hard that it is continuously catching and releasing? Does this go away once the pads are broken in? Any help would be greatly appreciated.

One more thing, the wheel only shakes when riding at 2-3 mph. Any faster than that, and it doesn't seem to do it.

Bri
... but my front ceramic coated rim is pretty worn. The coating wears patterns similar to where the spoke heads are. It probably does this because the rim is slightly more flexy around where the inner bed was drilled out for the spoke heads, so the rim is giving a tad bit more under the squeeze of the brakes.
 

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Discussion Starter · #5 ·
Just tried another set of pads (toed in) and the same thing happened. Also tried my original pads (not for ceramic rims) and noticed the same thing. I tried to tighten the bosses but they are pretty tight. I guess I never noticed it before.

I'll ask the LBS and maybe look into the spacers.
 

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Discussion Starter · #7 ·
I tried something else. I put the bike on a stand and pulled the brakes half-way - as I was doing this, I started to turn the wheel by hand. The wheel actually had more resistance corresponding with each spoke interval. That makes sense why the brakes would be catching more at each spoke. I guess I just never noticed it before. It's not a huge deal I guess, as long as it doesn't damage the fork.

I think the headset is tightened o.k. It is a brand new Chris King that was set up by the LBS.
 

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Discussion Starter · #8 ·
pimpbot said:
... but my front ceramic coated rim is pretty worn. The coating wears patterns similar to where the spoke heads are. It probably does this because the rim is slightly more flexy around where the inner bed was drilled out for the spoke heads, so the rim is giving a tad bit more under the squeeze of the brakes.
This is definately the problem. Should I keep riding this wheel? I have a spare set of wheels, but they are not as good as these.
 
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