Added reply in a thread Crank for Hyper bike? 11/20/2011 11:32 AM

It looks like the cranks are 170mm long, and I noticed that the sprocket is not driven by a lug on the side of the crank arm. I'm guessing that it must be splined and be driven by the spindle. The bottom bracket bearing assembly does look exactly like ... more »

Added reply in a thread Crank for Hyper bike? 11/19/2011 8:59 PM

Yes the cranks are aluminum. He bent it landing horizontally at the local skate park. How do I determine if the bottom bracket is "sealed"? Does that mean there are just sealed bearings in there? In looking at the Vein site, there seem to be 3 or so ... more »

Added reply in a thread Crank for Hyper bike? 11/19/2011 10:44 AM

Between motocross, judo, wrestling and boxing, he's way too busy to add BMX as another sport (and I'm not sure I could financially handle it

blush
). We've been out to the local tracks, and he enjoyed it, but he's not driven to be the next big thing ... more »
Started new thread Crank for Hyper bike? 11/19/2011 9:47 AM

My son has one of those Donnie Robinson Hyper bikes, and bent the right side crank. I don't know the length of the crank, but the sprocket is a 44t. He just plays around on it in dirt lots, some skatepark stuff, and rides it to school. I'm looking for ... more »

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