A 170mm crank arm, Black Diamond, sold as a replacement for a bent or worn arm or for a new build, and held in stock at our Kennington shop.
A single crank arm measuring 170mm, listed as Black Diamond. Crank length is the measurement from the centre of the bottom bracket axle to the centre of the pedal thread, and it shapes how your pedalling feels, with 170mm sitting between leverage and easy cadence. It is the part itself rather than a full chainset, so it suits anyone replacing an arm that has been bent in a crash or worn through regular use, and anyone building a bike up from parts.
Before ordering, check the measurement and fitting details of the arm you are taking off so the replacement matches. We have this one on the shelf in Kennington, south London, so you can collect it free of charge, or leave the bike with us and our mechanics will fit it the same day.
Free same-day Click & Collect. Order online and collect from our London workshop, usually ready within a couple of hours. We will email you the moment it is ready.
Home delivery. Dispatched the same working day on orders placed before 3pm. Standard UK delivery is £2.99, free on orders over £75, tracked, and typically arrives in 2 to 3 working days.
Fitting while you wait. Buying a part you would rather not fit yourself? Our mechanics can fit most parts on the spot. Just ask when you collect.
30-day returns. Changed your mind? Return any unused item in its original packaging within 30 days for a full refund.
This product has no reviews yet. Bought one? Be the first to tell other riders what you think.
More from the shop
Pop in, call us, or book the bike in. Our mechanics will sort it while you wait.
