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Big guys and big tires(6 posts)

Big guys and big tirescollinsc
Jun 11, 2002 6:24 PM
Can someone explain this to me? I'm not a big guy so I have no clue, but why is it that the clydes are told to run 25s or even 28s?

pinchflats nmcyclopathic
Jun 11, 2002 6:39 PM
Like he said ...Humma Hah
Jun 11, 2002 7:42 PM
Me, I run 1 3/4" tires, but that's excessive. I NEVER pinch flat on the road.

What happens in a pinch flat is the tube gets pinched between some square-edged obstacle in the road, maybe a concrete seam or pothole, and the rim. What actually results is a pair of small tears called a "snakebite". With high pressure tubes, the ensuing blowout can be so severe you never see the original pair of holes.

Higher pressure is generally the correct solution for lighter riders, but big guys may pinch even if they pump the tires up beyond recommended pressure. Hence leaning toward bigger tires.

Not to fret - you are not giving up much. Some studies suggest skinny tires may not really have lower rolling resistance than fatter ones. My own experience: my fat-tired cruiser, with 63 psi in the tires, will generally out-coast most roadbikes on a downhill. Whatever small disadvantage the tires give is offset by other factors, like steel and plenty of it.
Jun 12, 2002 6:07 AM
I have been running 700-26 tires. I weigh 235lbs. I was originally using 23's and bought the 26's by mistake. I decided to try them anyway and now I won't switch back. I did not notice any loss of speed. I did however notice the much improved ride on chip-seal roads (3/4" gravel!) and better corner traction.

I'd run 32s even if I WEREN'T a ClydesdaleSilverback
Jun 12, 2002 7:55 AM
Been there and done that with the 700x20s and 23s. It's like riding on the rim--harsh, jiggly, darty and no reserve of air if you get a little leak. I started using 35s for general riding a few years ago, and now split my time between 32s and 35s (actually measure about 25mm and 30mm). The ride is more comfortable, there's a little reserve of air if I get a slow leak, I can corner faster (or at least feel like I can, which amounts to the same thing), and I'm not slower in any way I can measure. If I were a racer riding at 100 percent of my ability all the time I might be, but for a guy who pretty much just rides around, the extra comfort and stability are well worth whatever small penalty there is in speed.
re: Big guys and big tireszray61
Jun 12, 2002 3:52 PM
Being a clydesdale, I originally used 25's to help keep my
rear wheel in true. You should see what 235lbs can do to a
wheel that has 21's on them. Immediately, I started to notice that
the ride improved.

That people change their whole wheels at crits but don't make tire changes for centuries, amazes me. A higher volume of air makes for a more comfortable ride without major penalities, especially at the speed centuries are ridden.