Mechanic help - chain length / caliper rub issue (pics)
#1
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From: Fogtown
Bikes: Litton, Gunnar, Iro
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!
- 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!
#4
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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I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC
#7
coasterbrakelockup
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Bikes: surly steamroller w/coaster brake, electra single speed cruiser, specialized rockhopper commuter, no-name single speed folder, 700c ultimate wheel, 24" unicycle, specialized bmx lsd, single seat single speed huffy tandem, pink upsidedown parade bike
Smaller tire or brake with better clearance.
#9
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.
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.
#10
Old fart



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#11
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From: Fogtown
Bikes: Litton, Gunnar, Iro
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. $$$
Thanks for all suggestions though, I appreciate the input, even when I can't use it for some reason or another. I bought the half link and will test it out when I get back in the garage at the end of this week.
Edit: Just ordered a single-pivot caliper brake. That plus the half link should resolve the issue for now.
I also can't buy a different frame at this time. $$$
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.
#12
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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