I don't race but over 50% of my riding is off road and I am happy with 63GI on a brakeless fixed track bike. Still allows me to go 30+ mph off road and can still do all the climbs (although I live in the undulating but not overly challenging New Forest which is compact stone rather than much mud letting me get away with road/touring tyres)
I don't race but over 50% of my riding is off road and I am happy with 63GI on a brakeless fixed track bike. Still allows me to go 30+ mph off road and can still do all the climbs (although I live in the undulating but not overly challenging New Forest which is compact stone rather than much mud letting me get away with road/touring tyres)