Originally Posted by
Leisesturm
I think the rule is to have at least 5mm to 7mm clearance all around your tire. What do you see? You are probably close to that with the 32's and 35's might be as good as it gets, but I don't know that. These days people are throwing the clearance rules out the window. Are you trying to stay with 700C to avoid the cost of new wheels? Because going to 650B allows for bigger tires assuming you also have disc brakes.
Have to agree should have optioned for a smaller rim when fitting the E motor to the front (wise in retrospect) however we ride mainly on paved "shared paths" and get away with the minimal clearance (can always lower the tyre pressure down to 30PSI when on gravel)
Without the E front tandem riding would no longer be posible as can't avoid the hills and Kathy can't walk far.
A fellow tandem rider in our group fitted 650 rims and runs wide tyres and can run any pressure he wants with comfort the decider on gravel .
They have done many overseas trips taking their tandem on trains and planes
Our Cannondale had 700/38 front and 700/40 rear and never had a problem
sp good luck and enjoy the ride