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Mechanic help - chain length / caliper rub issue (pics)

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Old 03-22-11 | 12:31 PM
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Mechanic help - chain length / caliper rub issue (pics)

I put together my daughter's birthday bike last night. Having trouble getting the 28 rando to fit, due to the chain length. I removed two links, and now I am caught between a too-tight chain on one hand and tire-to-brake caliper rub on the other . If the chain is a pretty basic KMC Z-410:

- Is it safe toput one of the links back in, i.e. pins not damaged by removal?
Wouldnt that push the axle off the back?

- Should I move to a half-link chain? (see pics of where axle is in the dropouts right now) Moving half link distance might be much better than a whole link. Reason I took two links out in the first place is that it looked like the wheel would be pretty far back in the dropouts if I didn't. Do you think I can out a whole link back in?

Alternate ideas? File the brake arms? Get a different (low-cost) brake with better clearance?



That's where the axle sits right now.



Tire spins right now, but there's no room for a pebble.


Thanks for any help!
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Old 03-22-11 | 12:40 PM
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I'm pretty sure you can put a link back in...as long as its not busted or anything
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Old 03-22-11 | 12:41 PM
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The cheapest solution would be a half link, which is about $3 or so at your LBS.
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Old 03-22-11 | 12:53 PM
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If you put a link back in the axle would sit too far back in the track end. You ave 3 options: smaller tire, different gearing or a half link.
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Old 03-22-11 | 01:11 PM
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Half link++.
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Old 03-22-11 | 01:17 PM
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I didn't know I could buy a half link by itself. Thanks!
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Old 03-22-11 | 03:44 PM
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Smaller tire or brake with better clearance.
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Old 03-22-11 | 04:01 PM
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Brake suggestion?
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Old 03-22-11 | 04:13 PM
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Cheapest: adding a half link.

Middle: A single pivot sidepull will give better clearance than a dual pivot. With a single pivot the tire will hit the brake at almost the same time it hits the seat stay bridge.

Most expensive but best (IMO): a frame with more tire clearance or horizontal dropouts instead of track ends.
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Old 03-22-11 | 04:14 PM
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Originally Posted by macnab
Alternate ideas? File the brake arms? Get a different (low-cost) brake with better clearance?



Tire spins right now, but there's no room for a pebble.


Thanks for any help!
Lower profile tire?

How wide is the present tire?
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Old 03-22-11 | 04:24 PM
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The tires are 28 Randos. Thinner tires are ruled out as an option, as the kid has skinny tire phobia. We ride dirt trails now and then in the park.

I also can't buy a different frame at this time. $$$

Thanks for all suggestions though, I appreciate the input, even when I can't use it for some reason or another. I bought the half link and will test it out when I get back in the garage at the end of this week.

Edit: Just ordered a single-pivot caliper brake. That plus the half link should resolve the issue for now.

Last edited by macnab; 03-22-11 at 04:50 PM.
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Old 03-22-11 | 08:04 PM
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I see you ordered another brake, but for future reference,filing it a mm is not going to cause fail.I've done it to the brake and forkcrown to fit 28s on one of my bikes and never had a problem.Also,if it spins freely you're good to go.
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Old 03-22-11 | 08:15 PM
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Your cog is slipping.
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macnab - what frame is that? I want to see a pic of the whole bike!
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Old 03-22-11 | 08:23 PM
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Looks like Maxway dropouts, but not stamped.
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Old 03-22-11 | 09:03 PM
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Your cog is slipping.
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Close but no cigar:



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Old 03-22-11 | 09:07 PM
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Looks like a Swobo Sanchez/I remember a thread about them recently.
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Old 03-22-11 | 09:10 PM
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Your cog is slipping.
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I think you're right!
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Old 03-23-11 | 01:47 AM
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I am not done with it yet. Doing some work-work in Kansas City this week. I'll shoot real/final pics when I get back this weekend.

edit :yeah its the 46 sanchez
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Old 03-23-11 | 01:51 AM
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Lucky kid, great dad.

We want more pics.
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Old 03-23-11 | 01:53 AM
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what you gunna do with that other brake?
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Old 03-23-11 | 02:16 AM
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Originally Posted by macnab
Kansas
Dorothy?!
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