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Sorry for the probably daft question, but i don't know this type of crank at all.
I'm debating a quick fix on my lads bike of swapping the crank for a 1X as we had an issue in the race where it wouldn't shift out of the bottom ring, so he was spinning out. It seems to be a problem with the Gripshift mechanism, so I can either fit a new trigger shifter, (which amazingly i don't have in the spares box) or i can fit some 1X cranks and he'll just use the middle ring.
On the WWW i'm seeing
Prowheel, 42x34x24T, 140mm with Chainguard and Square BB
But i can't say 100% if his bike isn't an older model so just wanted to confirm with you guys please.
It's a 140mm crank with 24, 34 and 42t chainrings with a chainguard that mounts on a square taper bottom bracket.
Might help if I put the pics to clarify
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[URL= http://i248.photobucket.com/albums/gg167/weeksy59/bike/IMG_20170417_144819_zpsukp8ompt.jp g" target="_blank">
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This is what I was thinking of swapping it with
Isn't a 40t chainring going to be way too big?
Could you not just remove the unneeded rings from the existing crack to go 1x?
I bought suntour 152 mm triple cranks from Amazon and replaced the rings with a superstar narrow wide ring and bash. Also require square taper bb.
Edit: your current cranks are not square taper, as far as I can see....
Tom,
Can't remove, they're pop rivet type installed rather than bolt and cap as per the big boys cranks we have
[quote=TomB ]Edit: your current cranks are not square taper, as far as I can see....
What makes you think that, and what interface do you think they are? Looks a lot like ST to me.
I tend to agree that 40t is going to be way too big, but just in case you were still going for that, then https://www.sjscycles.co.uk/chainsets/40-alloy-cotterless-crankset-with-40t-steel-18-inch-chainwheel-inc-guard-140-mm-cranks/ is very similar to what you're looking at, but with alu cranks rather than steel, so a lot lighter. I note that neither of those options have replaceable chainrings, so you won't be able to swap it out. Personally I'd probably go for TomB's suggestion of a cheap triple with removable rings.
Edit: your current cranks are not square taper, as far as I can see....
Yes they are.
You guys aware of a 140ST them, ideally about a 32/34t
Suntour or Thorn 152mm with a 30t n/w would be my recommendation. We've got the thorn and it's fine, but the suntour is a bit cheaper.
Longer cranks then. Hmmm
The 150mm length comes from islabike creigs.
If you want shorter, then there's still options:
edit - not that good (the 140's I found). Go with one that you can fit a n/w to like the stronglight above.