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If they were road bike brifters I'd wonder if the braking action is also rotating the shift part of the lever, but the front gears would make it harder, not easier, and the rear gears need 2~3 full swings … to jump 6 gears. …

Big at the front should generally not be combined with big at the back, for two reasons. It forces the chain to use a non-straight chain path, (hence "cross chaining") The derailleur spring has to s …

If you don't feel like doing all these mental calisthenics on the bike, get a cheap speedo that runs off a magnet. Mount the readout on your handlebars and simply look at it to learn your speed. No …

Everything on a bike is a tradeoff between efficiency and weight and complexity and cost. If you imagine the simplest drive ratio which is 1:1 then the cog and chainwheel could be any size up to the …

That's an 8 speed 3/32" chain.

So the noise persists whether you're pedalling or coasting? Means that its something moving all the time. Some things to check the tyres for lodged stones or sticky stuff the tyres for rubber spru …

I guess that when indexing your gears, one of the ferrules wasn't seated in the frame housing properly. Or possibly the outer came loose from the shifter, giving the same effect. … The fast-change to hard gears I can't explain, would suggest checking that the rear mech hanger is not bent and the cage/rear derailleur is vertical. …

I would be comfortable using a QR rear wheel on such a hanger, with caveats: Make sure the QR skewer is long enough to engage all the threads in the acorn nut. Put the QR lever on the left side of t …

A bike 18 months old is very unlikely to have a friction shifter. Did you mean its an older bike that you bought 18 months ago? Raise the bike off the ground, either in a stand or hang it from a tre …

A 7 speed cassette is just one generation too old to be useful. 8 through 10 speed all shared the same outer width by making the gears closer together, but 7 speed cassettes are narrower, so the freehub …

Sounds like an indexed thumb shifter or an indexed pod shifter or a trigger shifter. All three names mean the same kind of thing, though different designs may put the two levers in different places, …

The specs show a bike with 18 gears total. I can see a triple front chainring, suggesting this bike has a 6 speed freewheel on the back. …

You need to reindex the gears, and probably adjust the two limit screws. First some terminology: the big cog (easiest gear) we'll call 10, and the smallest/hardest gear we'll call 1. …

So the damage happened at the same time you shifted to a lower gear ? I'm guessing you were pushing hard because its a steep grade, and the chain was not fully engaged in the bigger cog when you push …

When the shifter won't push any further, you're out of gears. …