LC0 wheel test

[MCoach]

LC0 tested on a 10" wide wheel.

More background on the TTC forum under the pre-round 6 discussion.
With 400 schools participating, I'm trying to get more of you guys over there....it's pretty quiet.

For now, I'll just leave this as a talking point...

[mech5496]

10"?! I know that our 6" wide LC0's would happily fit a 8" rim, but I was not expecting that! Definitely interested in results on those, as well as LC3's and R25B's (7.5 wide) on recommended and wider rims.

[MCoach]

Hoosier technician told me it wouldn't fit on anything larger than a 7" wheel...

We went testing last night with that set of tires on 13psi, so they still hold normal pressure without debeading.
We used a 10" wide DWT wheel with a 4" inner shell and 6" outer shell.

More testing definitely required.

They also seem to also do burnouts just fine.
#Stancenation :P

[DMuusers]

Cool. What is the reason for testing? Also, don't you get into problems with scrub and trail and such or is it only on the rear?

[MCoach]

Daniel, we only tested on the rear as we only had two of these wheels. Yes scrub and trail may become a problem if designed around this specific wheel, but I would imagine a package like the Keizer wheel shells or something similarly available could properly accommodate the necessary packaging much better.

These were chosen because they're easily available, $50 a piece, and we could drill a new bolt pattern to test them quickly.

The reason for testing the tires is that increasing the wheel width is known to increase the sidewall stiffness, decrease the operating slip angle of the tire, sometimes promote more contact patch of the tire to the ground, and require more pressure to keep the tire seated with respect to normal tires. In the specific case of the LC0 these may not hold true at all due to it's peculiar construction, and it's outside the provided CALSPAN data, so it must be tested.


in the picture is a tire mounted on a 7" wide wheel, and on the right is a 10" wide wheel, both fitted with LC0s

[mech5496]

Yes scrub and trail may become a problem if designed around this specific wheel, but I would imagine a package like the Keizer wheel shells or something similarly available could properly accommodate the necessary packaging much better.

Nothing a well-designed multilink arrangement cannot solve! ;) I am definitely with you on testing wider rims, especially with LC0's and their floppy sidewalls...

[MCoach]

A quick look at Keizer shows that they do indeed offer a 10x9" centerlock with whatever backspacing you want, maybe that's close enough.

[FunkyChicken]

Back from the dead..... What did y'all find out? Have you run 9 and 8 inch wheels and compared?

[MCoach]

Back from the dead..... What did y'all find out? Have you run 9 and 8 inch wheels and compared?


Unfortunately, there was a unrelated car system failure that cut the testing short for the 10" wide wheels. We haven't tested it again, yet. We have a set of 8" wide wheels sitting on the shelf that I've wanted to do some data collection on, but I'm leaving the team for the real world this weekend. Metaphorical sad face. They are interesting to say the least.

U of Michigan-Dearborn ran Michigan 2015 with LC0s on 8" wide wheels and others have tested it I believe.
https://www.youtube.com/watch?v=Bf6yvESlGy8

[P^squared]

MCoach,

Can you share some data about the change in the tire's Outer Diameter from mounting the LC0s on wider rims ?

In India, we too face a challenge finding rims of the correct size

[MCoach]

P^squared,

The OD is essentially the same as when mounted on a smaller wheel such as 6" or 7" there is only a slight reduction in OD that is otherwise not noticeable.
With these particular tires, you'll see more OD change from the low stiffness of the tires during driving.

[P^squared]

Thanks a lot !

Its just that the angle in which the 7" vs. 10" picture was taken had got me worried.

[MCoach]

The two tires posted in that poorly taken photo also have vastly different amounts of tread left on the tire. The one on the left I want to say was about 75% life while the one on the 10" tire was mocked up with about 10% life to cords. That will also cause a decent difference in OD.