Repairs, maintenance, mechanical issues, or drivetrain parts.

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16
votes
2answers
2k views

Is there a practical gain from elliptical/oval chainrings?

I have seen competitive (amateur) cyclists with oval chainrings (front). What is the deal? Are they just for showing off, or is there a practical gain from it (different force transfer).
8
votes
3answers
6k views

Attaching a stem to a carbon steerer: how much torque?

So I decided to travel with my bike this week and to my surprise discovered that the steerer is carbon fiber. I had removed the stem from the steerer for packing but naively assumed it was aluminum ...
5
votes
7answers
5k views

What to use to clean a derailleur?

I'm not sure what type of solvent to use to clean a derailleur.
3
votes
1answer
571 views

Good 9-speed cog configuration for touring and which low-cost quality cassettes?

Alert: this cassette conf cannot be used in all touring locations because of poor support. I use it only in 1st world countries. The largest cog at the back is about 12-14cm. The length from ...
5
votes
2answers
4k views

Fork lube. Should I use it? If so how often?

I ride a mountain bike with front suspension. I've recently seen fork lube for sale on an online retailer. This got me thinking. Do I need to be using fork lube? How does it help? If I bought some how ...
4
votes
3answers
21k views

Unable to shift to lower gears; Shimano 6 speed SIS rear deraillers

Presently I'm able to ride my bike only in 5th and 6th gears. I cannot turn the shifter (it's too tight) to move the chain to lower gears. The low stop-screw is all right and it was working till ...
10
votes
1answer
1k views

How often should I strip my bike down?

How often should I give my bike a full service? Strip the bottom bracket, clean and grease it. Strip the groupset and freewheel. And what products (or type of) should be used for each process? It's ...
5
votes
1answer
1k views

One stripped post mount on suspension fork

I have a suspension fork, which has a stripped lower post mount, i.e. the bolt used to attach the brake caliper doesn't grip the post. Before anyone asks - yes, it is the correct size bolt, as the ...
7
votes
4answers
3k views

Bent front sprocket

My chain just started to slip off my front gears and it happens within a minute of riding. I discovered that the middle sprocket is bent. This leads me to my questions: How much should a LBS charge ...
5
votes
1answer
797 views

Swapping STIs for barends — what issues are likely to arise?

I'm planning to swap shifters and brake levers from one bike to another. One bike is a randonee with STI brifters, and the other is a Surly Long Haul Trucker with barends and separate brake levers. ...
15
votes
4answers
18k views

How do I prevent the rear derailleur from slipping gears?

What's the best way to tune the rear derailleur of my bike to stop slipping gears? It seems that every time I re-adjust it, the middle/upper gears are perfectly aligned, but the lower gears never ...
4
votes
3answers
2k views

How to clean out the inside threads of a braze-on?

I'm installing a basket on my cruiser, and getting some of the allen screws into the fork braze-ons is rough going. It feels like there's dirt or grease inside the threads of the braze-ons. Forcing ...
4
votes
1answer
537 views

Busted Dept store Mongoose Shifter - Scrap or Fix

My wife convinced me that we should buy bikes (2x$100.00) @ a dept store. I found a Mongoose (which I can remember used to be decent) and within 6mos I broke the bracket that holds the shifter in ...
15
votes
4answers
7k views

How to tighten a brake?

This is probably a really basic question but I'm confused by the whole brake mechanism so... My left (front wheel) brake has to be pulled in really far before it actually starts to brake (I guess ...
12
votes
7answers
1k views

How do I fix a puncture?

I got a flat/puncture on my bike tube, how can I fix it myself without going to the nearest bike shop? What kind of equipment would I need?
6
votes
2answers
2k views

Is it possible to replace bearings in Shimano XT bottom bracket cups?

Curious if I can just replace the bearings in my existing cups or if I would need to buy new cups? If possible to replace them then what are possible high quality replacement bearings?
5
votes
2answers
648 views

Wald basket legs too short for cruiser — how can I install the basket?

I recently purchased a large handlebar basket, a Wald 139-WW for my cruiser, a Trek Pure. I'm having trouble installing the basket. Context: The basket attaches using hooks on the basket to the ...