Considering going single speed…
I am considering building a winter commuter (possibly Pompetamine). Ideally from a cost perspective I’d single speed it. Ideally my legs would prefer an Alfine hub – as I am fat and unfit.
Commute is 17 miles, mostly quite flat but there are some short hills. Most days I would commute one way only (and go by train the other way).
Google seems to suggest that 32:18 is a common starting point for single speed. My road bike’s smallest chainring is 39, so would running 39:21 give a reasonable idea of the pain I will suffer on this? Something tells me crank length and tire diameter have an impact too – but are they small enough to ignore?
I don’t want to buy this and discover I can’t ride it for its main purpose.Posted 4 years agoD0NKSubscriber
I had a pompino for several years, 48×18 and that was spot on I reckon, 18mph cruising speed, bit of a push away from the lights or if it was windy and I was tired. I managed to drag it up some big seriously steep hills on just for fun rides too. You could try lower gearing but unless you’re really out of shape or have a very hilly commute I would go much lower.
Recently had a cxer running 42×18, offroad on well surfaced tracks was fine but too hard for rough uphill tracks and a bit spinny on the tarmac.Posted 4 years agoDrPMember
Am I odd in thinking a lot of the suggestions are very short gears?
If your commute is mostly flat, you’re really going to be spinning your legs very fast indeed at 39:18… This is road we’re talking about isn’t it?
I would consider something like 42:16 to 46:16 personally….!
DrPPosted 4 years agojonbaMember
I run 45:18. On my pompetamine. Use it on winter club runs and can cruise at 18mph keep up with the group as long as they don’t go much above 30 and climb hills. I’ve got up a 20% one but I had to use all the road by the end.
Alfine chainsets are cheap on planet x with a discount today. It is much easier and cheaper to change the rear sprocket than the chainring. Pick your chainring size to give you options.Posted 4 years ago
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