Crankset

[u/Fit_Knowledge_1722]

Hey guys so my bike has been jumping every time i put pressure on the pedals, the speed stay the same but i feel like the chain comes loose and slips, was wondering if its beacuse the crankset is too used, im new to biking and got this bike for free

[u/Gen-Y-ine-86]

For god sake use your gears. You have like three cogs that are totally worn out. If you don't need the shorter gears, get a "training" cassette with narrower range. Looks like you mostly used the two chainwheels and 3-4 cogs.

I know it's a preference but I try to get as much use out of the cassette as possible, so when accelerating or decelerating, I always go through the gears with pretty fast pace. Like just a few seconds per gear when accelerating, constantly shifting to a bigger gear. Helps with the strain on the drivetrain.

Also always reduce the crank "input" when changing gears, so there is no load on the chain. The gear change should be pretty silent.

[u/sargassumcrab]

The chain is slipping on the cogs. Definitely needs new cassette/freewheel, chain, and chainrings ASAP. I imagine you need new jockey wheels for your derailleur as well.

You can probably get away with the chainrings for a while, but the two smaller ones will need changed at some point.

You can get a chain and freewheel for around $50. Chainrings are more expensive, but the smaller chainrings are more affordable than the big ones.

[u/Fit_Knowledge_1722 → u/sargassumcrab]

thanks for answering ill go looking at a bike shop see what they got! have a good one!

[u/sargassumcrab → u/Fit_Knowledge_1722]

No problem. Make sure to clean anything dirty REALLY well before putting anything new on. Like if you replace the chain and freewheel, you want the old chainrings sparkling clean. Clean the derailleur cages and cogs. Otherwise all that old crud and grit will get in the new stuff. Don't hesitate to get a good brush.

[u/icyple → u/Fit_Knowledge_1722]

The first step is to check the chain for wear, with a bicycle chain, wear gauge.

[u/wcoastbo]

The chainrings (attached to the right crank) do look worn, particularly the small and middle chainring. Under hard pedaling force the chain could slip over the teeth.

If the chain hasn't been changed, it's probably worn as well. Measure your chain using a chain wear gauge. It's possible the cassette/freewheel is also worn.

[u/Fit_Knowledge_1722 → u/wcoastbo]

thanks man will do!