Originally Posted by
BarracksSi
Sigma might have also programmed its 26x1.75 setting as if the bike had knobby tires instead of smooth tread. The tire size is more about its carcass and the room it has inside, not how deep the tread is, so a smooth 26x1.75 slick tire would have a smaller "on-the-road" circumference than a 26x1.75 deep-lugged mud tire.
Good point...
Sigma don't say what type of tread pattern they've calibrated their computers for. I guess a slick and a knobbly tyre could have maybe at least 2cm diference in OD (10mm lugs x 2) whilst having identical carcass diameters.
And yeah... I'm still running the front at 35PSI, and the rear at 60PSI as it's an electric bike, with a rear-wheel hub motor, plus a steel frame, plus my 95kg body mass! I've based those pressures on a 45kg front loading v. an 85kg rear loading.
Cheers.
