I received 3 more registrations, bringing us to 11 teams total.

I've updated the registration page, and added a bar graph for us visual learners, to see which tires are in the lead for votes.

Check it out here.

There were 39 teams interested earlier, let's see those teams step up and register!

We are still interested, but we are also still working out a payment method with school funds. All our credit cards are just about maxed out, except for a few which we will ringing up in the middle of may. Damn gas bill is gonna be outrageous this year.

Same here Denny. Paperwork is rolling. Just waiting for approval.

The Avon website does not show a 20x6.2-13, is this a mistake in the spreadsheet or the Avon website?

Daniel, the avon website has a 520x160-13 radial tire (in metric).

In the "other" category, I just post what people send me

quote:

Originally posted by DJHache:
Daniel, the avon website has a 520x160-13 radial tire (in metric).

I guess I didn't look there since I thought everyone was running bias tires. Now I understand.

http://www.avonracing.com/frames.htm

Click on race tires, then crossply and 6.2/20-13 is about 2/3 of the way down. We ran these my freshman in the 2003 detoit compeition.

This post also serves as a bump for this thread. Register before it's too late.

Well, now it just looks like I'm lazy and didn't look far enough down the page. Do you know if they still make that tire, because I don't think our sponsor mentioned that one?

Mostly a bump.

I'm still trying to sort out the money for us. Hopefully it will be done in the next few days.

Uvic will be in early next week

I've updated the registered teams spreadsheet again. Things are getting interesting with the multiple votes per tire per team option. Here it is.

We're up to $5000, well on the way to our goal. Of course, the more money we get, the more tires we test and in more detail.

Teams can request changes in their voting if they want to put multiple votes on a certain tire. Contact me by email.

Denny,
I emailed you our votes. Let me know if you dont get it.

Updated again, we're at 16 teams, 10 received payments. Keep them coming!

Hey WWU. Why do you want goodyear 10" tires so bad. Seems like Hoosier is the brand of choice in 13's. The 10's have the same compounds as the 13's right?

Isn't that what we're trying to find out, Bryan? The compound is the same but I know that a year or two ago the construction was different (13s used kevlar; 10s didn't).

We've narrowed our voting choices down to, er, 6. Decisions by committee are always a bad thing (until you make the wrong decision, anyway).

For our first 5 cars we ran Hoosier 10". For our last car we switched to the Goodyear 10". It was mostly a guess. So now we have a bunch of Goodyear 10" tires around here and the next car will have them too. Why is Hoosier the brand of choice for the 13"? It can't be because everyone has data that shows they are better. I know that some teams have done comparison testing but I bet it is still largely a guess.

I threw all of our votes to one tire because I really want to see what the 10" tires do in the testing. I knew that the 13" tires would get most of the votes so we're kind of voting for the underdog – trying to make the biggest difference.

It surprises me that all of the teams running the 13" tires don't want to know what the 10" tires are capable of. We want the data anyway but it will be a shame if we don't get data for a 10". Maybe I can talk some teams into switching a vote or two. Who knows - Goodyear 10" tires could be magical...

For us the 13s allow the uprights, hubs and brakes to be completely contained inside the wheel giving us longer a-arms and "better"(the way we want) packaging. I guess there are weight advantages but 13 offer what we feel are outweighing advantages. So, being that our choice of 13s is based on non grip related issues, we don't really care how 10s grip.

that being said, if for some reason it is discovered that 10s grip way better, we will have to do some serious rethinking.

We have pretty much got past the packaging issues of using the 10" tires, and assume that the polar moment is better for them (although we need to test this). Given this reasons we think they are at least on par with the 13"s and could be better, we don't really know though and so we would like to have them tested to find out. Also the Goodyear data for the 10" pretty much uses a different size tire for most of the data, so it is hard to know how far off our tires are from their data (assuming it is accurate anyway).

Also the Goodyear data show that at a 100lbs of normal force the 10s can make about 300lbs of lateral force (i think slip angle is about 5-8, and camber is -1). I know our cars with driver are a little heavier, and there is weight transfer as well, but if I'm not mistaken that is around 2-3g lateral acceleration. Not all of the other GoodYear data shows quite the same high coefficient of friction numbers, and we were assumuing that they had consistency at least with their own data.

19.5x6.5-10
(the data we are supposed to use for the 18x6.5-10)

vs

20x8-13

Hey Denny, could you somehow modify the graph of votes to show the difference between votes that are paid (and will count) versus the votes that have not yet been paid (and may not count).

Thanks for you work on this project.