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pic: HiGrips after two events
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Re: pic: HiGrips after two events
2 or our 4 are almost gone with 2 events; we were only running for about half of the first event. With only about 4 or 5 hours of good practice they wear a lot faster then we thought they did. They still do their job well though.
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some teams may even opt for even softer wheels which would have to be replaced during the regional, in exchange for higher traction! |
Re: pic: HiGrips after two events
Considering we replace our blue (nitrile) roughtop once per event (we could probably do once per two events if defense is light) at a cost of over $5 per wheel, these wheels (and the vex equivalent) are darn good values.
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Once you account for some waste when cutting, and one or two treads scrapped per batch of 20-30, it's a tad over $5 a wheel for us. We have a father that is very meticulous cutting them. We could do a slightly more efficient cut and save maybe 20%, but the results he gets are worth it to us. |
Re: pic: HiGrips after two events
About par for the course. We put two new center wheels on Thursday at Palmetto; this is what they looked like after the Orlando finals. (No pictures in between, but reportedly most of the wear was eliminations themselves.)
Haven't had it as bad in the corners, but we will have spares in St. Louis just to cover ourselves. |
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Out of curiosity is there a noticeable change in traction between a new and worn (to this degree) wheel?
I would suspect that there's actually fairly little change if you were to measure it. I wouldn't even be surprised if the CoF increased slightly. |
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Here is a link to one of the numerous posts I've made on the subject: http://www.chiefdelphi.com/forums/sh...4&postcount=23 It comes down to something called "mechanical keying" in the racecar world (where this sort of interaction is investigated in great detail). Basically as a wheel is loaded more and more the mechanical interlocking of the tire's tread into its driving surface eventually saturates and then the calculated coefficient of friction is reduced as the wheel is loaded more. This isn't a step change, but a gradual progression as wheel load is increased. There have been teams who've tested 1in wide vs 2in wide wheels and found that 2in wide wheels provide a higher coefficient of friction. There have been teams (including one this year) that test larger diameter wheels as generating more friction, presumably due to a larger contact patch and thus lower contact pressure. |
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Re: pic: HiGrips after two events
I wonder if AndyMark changed the material since last year. Our team used 4in HiGrip wheels for hours of practice leading up to IRI and through the end of the off-season. We only replaced our back wheels after a fall in the IRI semi finals where they cracked but the middle wheels were put on in June and have been used a lot since then with no where near this level of wear down. We still use that robot for defense on this year's robot.
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Re: pic: HiGrips after two events
The wheel behind it does not look as bad. Remember you are in a district comp and have at least 24 matches plus eliminations on those wheels. Also, may be you are under estimating just how much you beat those wheels this weekend. After playing at Lenape, I'm surprised that there is any tread at all. Buy some new wheels and get set for a change out Thursday at Mars champs.Hopefully your design allows for a quick wheel swap. The big question is can one set hold up at MAR because I can say it will be more intense than this weekend.
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