Bicycles Asked by kdev on August 10, 2020
First time here!
My brand new bike arrived this evening and I’ve broken it with an hour.
It’s a Vitus Nucleus 27 VR Bike (Altus 2×9) 2020
I took it out and about 50 mins into the ride I noticed the right pedal was feeling a bit off.
I just had the default plastic pedals on so assumed I’d just pushed them too hard.
Turns out I must have cross threaded the pedal and now there’s no thread left in my drive side crank arm.
The crankset is the SR Suntour XCM 36/22T 175mm.
I can’t find a direct replacement – it’s out of stock everywhere.
My question: What are my options for replacing this? Is there another crankset that I could easily slot into place? Is there an obvious upgrade?
Thanks for your help!
It might be possible to make a new thread using helicoil. It is a job for a good bike-shop but should be cheaper than a good pair of cranks.
Answered by Vladimir F on August 10, 2020
You could replace the crank with any Shimano 2x9 crank for a square taper cartridge bottom bracket (with the same chainring sizes are crank arm length or course). If the bike is equipped with an Altus groupset then an Altus 2x9 crank would be a reasonable choice.
There is a bit of an annoying wrinkle to this, different square taper crank models require different specific axle lengths to achieve the correct chainline. The existing bottom bracket axle might not be the correct length for the crank you choose.
As an example The Vitus Nucleus 27 VR page helpfully tells us the the BB axle length is 113.5mm. The Altus FC-MT101-2 crank needs a 'LL123' code bottom bracket axle which I think is actually 122.5mm.
Often it's easier to buy and install a crank and the correct bottom bracket at the same time. This also opens up the possibility of a 2x9 crank with a Hollowtech II external cup bottom bracket, which I think are in the Acera line and would be an upgrade.
Special tools are required to remove and install bottom brackets, and a crank puller is needed to get crank arms off square taper axles. Bottom brackets and crank arms should also be installed with a torque wrench. It's especially critical to get square taper crank arms tightened properly.
If you had a an issue with pedal installation you'd probably want a bike repair shop to do the installation for you, and they will of course have the tools.
Answered by Argenti Apparatus on August 10, 2020
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