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Why micro gearing sucks for race bikes...
kennyhunter6061:
My mate Stuart bought a race bike last year for a good price. The bike came with good parts but the Profile hubs came with a 9T driver, not a regular race-sized cog. He had been struggling with a too-big front ring for months so a week past Sunday he went to Evans and bought a 25t chainring to fit the Shimano Saint crankset. He told the guys at the shop that the ring was for a bmx race bike with Saints. Stuart immediately fitted the ring and headed to Clydebank track. He pottered around the track a few times before giving my racing buddy Dan Kerr a go. Dan (37) decided to do a practice gate and when the gate dropped he went flying over the bars on his first pedal, slamming hard onto the concrete start hill causing him major pain. At first I thought the chain had come off but when Dan stopped rolling down the hill and got up it was clear what had happened. I've run Saints for nearly 2 years with a 42T ring with no problems so this just shows what can happen if you're 37 years old and try micro gearing on your race bike. Or maybe Dan just had too much porridge that day ;D
SaMAlex:
that chainring dont look up to much, and only having 4 bolts cant be great.
kennyhunter6061:
The ring itself is pretty thick at the bolts but Saints come with alloy bolts which can't be as strong as the usual bmx cromo/stainless ones. I reckon one of the bolts has snapped and the ring has then done likewise. The problem with the 4-bolt design is that if one bolt fails it makes almost 1/2 the ring unsupported, whereas with a 5-bolt design it's far less and the other bolts have a better chance of keeping it all together.
dibly:
that guy must have some chuffing power in his legs mate ;)
HEYWOOD BMX:
:) I sometimes run a 36/13 on my racebike and have broken a few chains off the gate.When I watch some of the local street riders come down to my track with 25/9,they seem to pedal like hell but go nowhere!
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