Mechanic help - chain length / caliper rub issue (pics)
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!
- 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!
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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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
03-22-11, 03:44 PM
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Smaller tire or brake with better clearance.
03-22-11, 04:13 PM
#9
Constant tinkerer
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.
03-22-11, 04:14 PM
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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. $$$
Thanks for all suggestions though, I appreciate the input, even when I can't use it for some reason or another. I bought the half link and will test it out when I get back in the garage at the end of this week.
Edit: Just ordered a single-pivot caliper brake. That plus the half link should resolve the issue for now.
I also can't buy a different frame at this time. $$$
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.
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.
03-22-11, 08:15 PM
#13
Your cog is slipping.
macnab - what frame is that? I want to see a pic of the whole bike!
03-22-11, 09:03 PM
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Your cog is slipping.
Close but no cigar:
03-22-11, 09:07 PM
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Looks like a Swobo Sanchez/I remember a thread about them recently.
03-22-11, 09:10 PM
#17
Your cog is slipping.
I think you're right!
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
edit :yeah its the 46 sanchez
03-23-11, 01:51 AM
#19
Bicycle Repair Man !!!
Lucky kid, great dad.
We want more pics.
We want more pics.
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