- Go on Hope gis a job- 28 tooth chain ring
Reading the review of the narrow wide rings “£40 odd?, i could make one for that”
So some measureing and CADing and off cuts of ali here we are. A 28 tooth ring on a 104 pcd fitting. Kind of in between where the middle and inner rings would be.
bit of fine tuning and it should be good to go on the bike.Posted 4 years agoJon TaylorSubscriber
Nice idea using a carrier/bash to mount to the 104 BCD. What’s the actual BCD of the 28 ring (I’m assuming they’re 2 separate parts- the carrier and the ring?)
Any way to reduce the offset – it’s going to make your chain line a bit off – but hopefully ok in small-small.Posted 4 years ago
Thanks for the comments.
An evening in the garage paying with the dirty words in the bike industry (standards and tolerances).
So not all chain ring bolts have the same thread (or diameter) and arm thickness between the outer and middle ring can vary up to 1mm?
Anyway some work with the file to get the carrier to clear the crank and it’s on.
Am going to make another chain ring as the inner plates of the chain have a square notch on the outer edges which is catching plus i think some clearance on the tooth profile might be needed.
Also thinking you only have to chamfer on side of the teeth as it’s only the top third of the cassette that creates a high chain angle.Posted 4 years ago
Well its survived a peak ride, all the fun of the pootle, chain only came of when we were stood still and i back pedaled. Not bad considering no cain guide or clutch mech. Also managed round on a 11-34 cassette. On the mk2 chain ring that now has some clearence machined into it for the chain.Posted 4 years ago
I’d be interested to know if you ever find that you’re under-geared.
Occasionally people with a 30t complain about it, but I’m not convinced it would be a big deal to me.
Well for normal pottering say 10-15mph its fine, climbing was ok for what we covered.
As for spinning out in the impromptu race for cake at the end of the day 20mph was just managable and i “spun out” at 23mph.
ive a graph somewhere comparing ratios (all other things being equal)Posted 4 years ago
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