Parts for hand ergometer (exercise bike)

[irving2008]

Hi irving
If i was making the handle assembly i would manufacture from one piece of ally with an interference fit for your two bearings. also make the 150mm length 22mm Dia & then you can fit some proper cycle handlebar covers.I bought that ring gear just to see if i could work out the gear form(probable modular) don't know if the required wheel size will mesh though as the mating components from the hub it came from are rather small.
Take care M8

Thanks for your input.

I had considered machining it from the solid but thats a huge amount of wastage of a 65 or 70mm bar x ~350mm. Thats over £50 +p&p on ebay to throw 50% away! However if someone wants to provide the stock for free then I'm not proud

Not sure a pure interference fit would be stable enough and all the designs i looked at use a clamp arrangement with either one or two clamp bolts. Two bolts might be overkill tho.

The diameter of the grip needs to be much bigger than a normal cycle handle bar as I cant wrap my fingers that tightly. The 32mm dia is the same size as the one I use at the rehab unit and will be wrapped in bar tape or sleeved with rubber tube heatshrunk on.