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17 January, 2012 11:23PM
I'm not entirely certain where you are coming from with your post. Are you referring to having changed bike style ie from mountain bike to hybrid or road, or have you bought in to the new "29'er"s? (A 29'er is a mountain bike fitted with 700c size rims but mountain style tyres... still a bit specialist but something which is catching on)

A 700c wheel simply denotes what diameter the wheel is. 700c is larger in diameter than a 26" wheel, however it is not the diameter of the wheel which dictates the level of drag. That is governed by the width of the tyre (ie how much rubber you are putting on the ground), the distinct tread pattern on that tyre, the quality of rubber and it can be further compounded by tyres which are set at the wrong (too low) pressure.

Typically a 700c tyre fitted to a "race" style bike will have a cross sectional width of approx 23-28mm. However, a 700c "hybrid" style tyre is more ussually 35-38mm wide. A mountain bike tyre is closer to 50mm across. Tyre pressure on the narrower 700c tyre would typically be 80-120psi, compared to 35-50psi on the 26".

Next, the tread pattern. Open "knobbly tread designs create a higher rolling resistance (drag) compared to a smoother tread. Typically mountain bikes would have a knobbly design whereas hybrids would commonly have a smoother central tread section with knobbly edges and a race tyre would be almost smooth.

If you could expand on what style of bike you were riding and have moved to, make/model etc we can possibly offer some more constructive advice. I'd also be interested to hear what the source was regarding centres of gravity and "easier uphill".
Subject Author Posted

700c wheels are a drag!

Steve 17 January, 2012 06:50PM

Re: 700c wheels are a drag!

siwatts 17 January, 2012 11:23PM

Re: 700c wheels are a drag!

DocB 18 January, 2012 09:10AM

Re: 700c wheels are a drag!

Steve 18 January, 2012 06:32PM

Re: 700c wheels are a drag!

Steve 18 January, 2012 06:54PM

Re: 700c wheels are a drag!

siwatts 19 January, 2012 01:43AM

Re: 700c wheels are a drag!

DocB 19 January, 2012 07:25AM

Re: 700c wheels are a drag!

Steve 20 January, 2012 02:10PM

Re: 700c wheels are a drag!

DocB 20 January, 2012 02:35PM

Re: 700c wheels are a drag!

Steve 21 January, 2012 06:17PM

Re: 700c wheels are a drag!

cotterpin 18 January, 2012 10:53AM

Re: 700c wheels are a drag!

Steve 18 January, 2012 06:29PM



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