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Tires.....(4 posts)

Oct 8, 2002 7:58 PM
Hope these aren't lame questions....I'm rather new to riding and need some beginner type information....

I'm 6'2" and 240lbs....I ride a Trek X01 cyclocross bike, but use it in recreational road races...just racing against myself really....

It has knobbied 700x35c tires on Rolf Rims.....I'd like to use a slick for better times in the centuries that I ride....

I've been advised by LBS that I with those wheels I can ride a 23 or 25c tire....

My question is should I? With my higher weight would that be problem on a narrower tire...I guess I could shop around for some 28's or even a smoother tread on a 32 or 35c cyclo tire.

Can I expect signifcant speed increases if the tire gets narrower and pressures higher....

Any recommendations on a particular tire...I'd like to keep it in the 20-30$ range....

What is the advantage/disadvantage to folded tires and kevlar beaded ones?

Thanks for your time.
re: Tires.....Wheelz
Oct 9, 2002 12:04 PM
I used to be a heavy rider, about 230 lbs. I ran/run the 23 Michelin Axial Pro without an issue for several years. This past summer, I switched to the Michelin Carbon, due to the puncture resistance and the lower cost.

The most efficient tires are 23's. Wider or narrower tires generally provide additional rolling resistance. The higher you can get your tire pressure, the less rolling resistance you will have. Vredistein makes a great road clincher that will hold 145 lbs pressure, but it costs about $50. I also like the Vredistein Cross tire for off road use. It works well at lower pressues than other clinchers providing more traction.

Kevlar beaded tires will go on and off the rim easier and you can fold spare and take it with you on long rides. Kevlar tires also tend to be lighter than wire bead as well.

re: Tires.....Jofa
Oct 9, 2002 2:30 PM
Any of the tyre sizes you have mentioned will fit on your rims. Road bikes with tight clearances are precluded from using the wider varieties: your bike with its large clearance will be quite happy on any of them. There is no minimum size that I know of, unless the Rolf rims you have are wider than ordinary road ones, which I doubt: in which case, you could use tyres as thin as 18mm, though you wouldn't want to. (And nor would anybody else, hence they are always on offer cheaply in bike shops).

Slick tyres will be a drastic improvement for you, for their greater grip, and their increased efficiency. The distinction between different sizes is slight in these respects. For academic interest, the energy losses that similar tyres of different sizes incur can be plotted into something like a bell curve. Usually the peak - most efficient (lowest RR) - examples are somewhere around an inch in cross-section, with those narrower and wider falling off to the edges. So 25 and 28mm tyres are ideal in this respect, and are correspondingly comfier than skinny 23 and 20mm tyres. Professional racers use narrow tyres for their lower weight and reduced frontal area, but the rest of us need have no interest in such particulars.

My favourite tyres are those made by Avocet. Properly slick as all road tyres should be, and they have always used decent ordinary carbon-blacked rubber. The casings are as well made as any I have seen since the heyday of hand-made tubulars. They are usually fairly cheap, but are not seen commonly. They are made in sizes up to 30- something.

Thanks for the Reply (NP)callthedoctor
Oct 9, 2002 8:17 PM