Hello!
I'm looking for shorter cranks and a lower gear for my daughter's 2011 Haro jr BMX (she's 6)
I bought it for Christmas, did a mild resto on it (after parcelforce lost it and smashed it up), anyway she loves the bike BUT being only 6 finds the cranks too long (155mm) and gearing too high. When she rides it her knees come up to her chest!
So,
There seem to be three options:
1. Keep the existing cranks, get some crank adaptors to make them shorter, and a bigger chainring (£50ish, will make the cranks wider which I'm not keen on)
http://www.bikecare.co.uk/crank_shortners.html2. Find some shorter 3 pc arms with a bigger chainring (not easy to find, guessing £50+)
3. Swap the BB and put in a 1 pc crank. Small 1pc cranks are cheap (£15ish) and common so this would seem to be a good option - but can you get a BB?
Here's some photos I've found online of the bike and a crank
Cheers