Replacement left arm crank?
robb_o
Posts: 332
Hi everyone, been a while since I posted on here.
My friends left crank arm has come off whilst riding and the teeth are all chewed up so we need to buy a replacement (the bottom bracket looks fine).
I've only ever dealt with square tapers in my life and his are "splined" or "ISIS", not sure if that's the correct wordings, but it's loads of teeth.
my question is this... i know cranks come in different lengths (his are 170mm) but do the width of the teeth come in different sizes?
ie: if we buy different cranks, might they be too shallow or deep to fit on the bottom bracket.
I've included a random picture off the internet to explain what i mean...
My friends left crank arm has come off whilst riding and the teeth are all chewed up so we need to buy a replacement (the bottom bracket looks fine).
I've only ever dealt with square tapers in my life and his are "splined" or "ISIS", not sure if that's the correct wordings, but it's loads of teeth.
my question is this... i know cranks come in different lengths (his are 170mm) but do the width of the teeth come in different sizes?
ie: if we buy different cranks, might they be too shallow or deep to fit on the bottom bracket.
I've included a random picture off the internet to explain what i mean...
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Comments
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well first what are the cranks?
and how many splines.
they all need to match.
and the crank arm in that picture has no splines there. (they are on the other arm
). "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
Parktools :?:SheldonBrown0 -
he's got a cheap rubbish bike but i did write down the info from the crank arm...
PYTHON
170mm
Vangreen BD
so i actually need to count the number of splines on the BB?
i was hoping we could just buy any old crank from ebay for cheap and it would fit, he's not bothered about matching colours or brands.
and fair point about the pic, i was in a rush so grabbed the first google image i found.0 -
There are more than one mountings with 'lots of teeth' so you need to get the right one, count them!
SimonCurrently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.0 -
http://www.parktool.com/blog/repair-hel ... ervice-bbt
shows two internal BBs with splines.
there there are 2 more the power spline and the power drive non are compatible with each other.
do some counting or take pictures."Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
Parktools :?:SheldonBrown0 -
Wouldnt it either be an ISIS or shimano Octalink he's talking about?? sounds that way to me in which case it will either be 8 (octalink) or 10 (ISIS).0
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jayson wrote:Wouldnt it either be an ISIS or shimano Octalink he's talking about?? sounds that way to me in which case it will either be 8 (octalink) or 10 (ISIS).
more likely to be the cheaper power spline or power drive. powerspline being the more likely."Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
Parktools :?:SheldonBrown0 -
cheers for the replies everyone, i have txt him asking him to send me a pic of the BB.
i will reply on here with the photo as soon as he comes back to me.0 -
hi here's the pic he's txt me.
rubbish quality but i think i can just about count 12 splines?
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that is a Power spline BB (12 splines)."Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
Parktools :?:SheldonBrown0 -
thanks for the reply,
so do powerspline cranks come in different sizes?
like the depth of the splined hole i mean.
i know cranks come in different lengths, 170mm, 175mm, etc.0 -
nope."Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
Parktools :?:SheldonBrown0 -
cheers mate.
not finding many on ebay hmmmm.
searched for "powerspline" and "power spline".0 -
