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Originally Posted by Karthik
I've been thinking about the Roughtop vs. Wedgetop debate for the past few days. I'd be really curious to see some concrete data on this. Is there anyone out there who'd be willing to do a few traction tests?
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I just did some tests just last week. Roughtop gives a better coefficient of friction, from what my tests show. We are getting ready to sell 4", 5", & 6" diameter wheels with replaceable treads through
AndyMark.biz. Here are my preliminary results:
surface: FIRST field carpet
weight on tread: 25 lbs.
tread size: 4"x1.5"
Material: Urethane roughtop, 0.20 thick
Max pull force to begin movement: 28 lbs
coefficient of friction: 28/25 = 1.1
Material: SBR wedgetop, 0.25 thick
Max pull force to begin movement: 31 lbs
coefficient of friction: 31/25 = 1.2
Material: SBR roughtop, 0.25 thick
Max pull force to begin movement: 33 lbs
coefficient of friction: 33/25 = 1.3
We are going through a website upgrade, so these wheels are not shown yet. Here are some specifics of our "Traction Wheels":
4" dia x 1.3" wide tread - $46
5" dia x 1.8" wide tread - $50
6" dia x 1.8" wide tread - $54
All 3 sizes have these qualities:
3/4" bore w/ roller bearing
Molded nylon body w/ fiberglass reinforcement
aluminum drive hub with sprocket mounting holes
aluminum sprockets as optional parts (35 series)
Treads can be easily replaced with screws
Once the site gets updated, I will post a link. These wheels will be available in mid-November.
Andy B.