crankset / bottom bracket options
racer132
Posts: 4
Looking for advice please, I have a 2012 specialized rochopper comp and I need to replace the crankset however I can't get a replacement to suit my 68 x 126 octalink BB. How do I find an upgrade option keeping the same chain alignment ?
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Comments
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All Shimano are 47.5 or 50mm (apart from some of the DH stuff), so pick a Shimano. I'm assuming a Rockhopper will have a normal chainline of course.
Why do you need to replace the cranks not just the rings?Currently 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 -
All Shimano are 47.5 or 50mm (apart from some of the DH stuff), so pick a Shimano. I'm assuming a Rockhopper will have a normal chainline of course.
Why do you need to replace the cranks not just the rings?
What are those measurements you quote ? Acording to Evans cycles the original acera crankset is now unavailable so was going to upgrade.0 -
The number are the chainline, measured from the centre of the BB.I don't do smileys.
There is no secret ingredient - Kung Fu Panda
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Parktools0 -
Chainline, distance from the centreline of the frame to the middle ring of a triple (or between inner and outer rings of a double).
http://www.chainreactioncycles.com/shimano-acera-m361-triple-chainset-octalink/rp-prod106890
Not sure what width BB it's designed for as I can't find it on the Shimano info site but according to the CRC Q&A its a 126mm.Currently 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 -
Ah OK, thanks for the info, I looked at a replacement Shimano crank set with the same amount of teeth on it as my original but it is designed for an 118 mm BB would it be simply a case of swapping my 68 x 126 BB for a new 68 x 118 BB ?0
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Probably better off just fitting a new Deore HTII that comes with an external BB.I don't do smileys.
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools0 -
Or use that linked to Acera which is meant for a 126mm BB according to the Q&A.Currently 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
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Out of stock at CRC. For the extra £13 the Deore looks much more gnarlier.
http://www.chainreactioncycles.com/shimano-deore-m590-9-speed-triple-chainset/rp-prod40496I don't do smileys.
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools0 -
Agreed, now they are out of stock a Deore HT2 makes best sense.Currently 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
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Probably better off just fitting a new Deore HTII that comes with an external BB.
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