Power Cranks!

Dodson with 172.5 Power Cranks 57.5cm top tube steel Tange2 tubing | eBay

3-5mph gain in 6-9 months,
I think any training could get that result.
Well thats what there website claims.
Never seen them

these and a free coaster = least fixed drive train evah

Narre Warren … Mr Dylan’s hood.