Hi All,
I'm looking to switch from a slick-tyred MTB to a drop-bar road bike for my commute, and I need some help with some numbers.
Can someone tell me what the typical rolling diameter is for a 700c wheel with say a 21 or 23mm tyre on it?
Also, for the same amount of effort, how much faster do you reckon I'd go up hills dropping from a 14.5kg slick-tyred MTB to say a 9.5kg roadie? (I'm doing 13-15km/hr on those sections at present.)
The point to these geeky questions is this: I've worked back some numbers for cadence on some of the steeper hills on my route and I'm trying to work out what gearing I'll need on the roadie to ensure I don't overstress my surgically altered knees. I'm hoping to avoid the need for a triple chainring on the front.
Thanks for your help! Much appreciated.
I'm looking to switch from a slick-tyred MTB to a drop-bar road bike for my commute, and I need some help with some numbers.
Can someone tell me what the typical rolling diameter is for a 700c wheel with say a 21 or 23mm tyre on it?
Also, for the same amount of effort, how much faster do you reckon I'd go up hills dropping from a 14.5kg slick-tyred MTB to say a 9.5kg roadie? (I'm doing 13-15km/hr on those sections at present.)
The point to these geeky questions is this: I've worked back some numbers for cadence on some of the steeper hills on my route and I'm trying to work out what gearing I'll need on the roadie to ensure I don't overstress my surgically altered knees. I'm hoping to avoid the need for a triple chainring on the front.
Thanks for your help! Much appreciated.