Crank slipping when putting power down
johnborton1
Posts: 9
in General Chat
Hi
Did abit of research and i am yet to find an answer to my problem......
When i try and go fast on the bike and move up gears and put the power down the crank seems to be slipping under the chain.... its rather difficult for me to explain as i dont really know what is going on myself but if anyone has heard of something like this happening, can you let me know what you did to fix it?
Thanks
JB
Did abit of research and i am yet to find an answer to my problem......
When i try and go fast on the bike and move up gears and put the power down the crank seems to be slipping under the chain.... its rather difficult for me to explain as i dont really know what is going on myself but if anyone has heard of something like this happening, can you let me know what you did to fix it?
Thanks
JB
0
Comments
Then post the link from youtube to here and then we can see what the prob is
I'm no expert, but I guess the first questions are
a) is it the chain slipping on the front chainring or in fact is it slipping on the cassette.
b) are you changing up the the front or rear gears at the time of the slippage.
If you're changing up on the front it could be the front deraillieur needs adjusting, the rear might point to the chain being changed but not the cassette (or time to change the chain and cassette)
Then randomly someone films it.
Then randomly someone films it.[/quote:2h5w1nd4]
Sorry - wasnt having a pop, just made me smile when I thought about it.
Maybe the same problem , as he would pedal the it felt as if the chain had come off but it hadn't, the rear cassette would spin without turning the wheel.
If the chain is stretched check the teeth on the chainset also the cassette, hopefully if anything is worn then its just the cassette so get it and chain replaced.
If the chainset has worn then its gonna cost a bit more Im afraid.
Chain stretch, chain ring and cassette wear will not make the crank arms slip. Not engage gears properly and chain slippage for sure, but not crank slippage.
Depending on the type of bottom bracket and cranks you have it is more likely this combination than those other suggestions.
The most logical suggestion is that your cranks have become loose at some point and have worn the spline that holds them. You've probably had your bike serviced and they've tightened everything up again, but when you pedal over the dead spot at the top and your power kicks in, thats when you'll get slippage. Not much i'm guessing but enough to annoy you.
I'd suggest getting this checked out first.
If its not this then, unless you're using really old wheels what we use to call a screw on "block" (usually 6 or 7 sprockets mounted in on a free hub and screwed in one peice to the hub), then the last possible idea is that the pawls within the hub have seized or are worn, which means the cassette and free hub body are slowly disintegrating the hub spline. This is almost un-heard of so i'd go with my first suggestion.
what sort of cranks are you using by the way?
Oh, and a video is going to be very difficult to show this movement.
cheers
David