I'm curious is anyone using the mazda millenia 15x6 rims to autocross for their itr? If so are they really as light as this site says at only 11.5 lbs. Also I know the bore for those mazda rims is 3mm bigger than for the itr. If anyone uses these millenia rims did you have to use some type of a spacer ring to take up the 3mm difference and where did you get that ring. Thanks

 

I was told at EXPO that those are the rims to use and that they are legal in SCCA stock class.
I'm presently looking for some at a reasonable price, but there was no mention of spacers.If the bore concerns you, just be sure to cross tighten the bolts and they will self center...besides at auto-x speeds, you won't notice wobbles.

 

The millenia rims are not hub centric on the ITR hubs. BBQ's right that the lugs will center the rim. Just make sure you get them good and snug (not torqued) before you lower the car onto the wheels. Keep the jack supporting the car while you torque, and you'll be fine.

The wheels are legal for SCCA DS since they are the same size and offset as the original ITR rims. I'll try to remember to have them weighed when I swap them around next week, since I'm kind of curious what they really are.

The spacers are two fold...
Regardless of the tire size, they increase the track which provides a small increase in track.
They are NEEDED for tires wider than 205 to keep the tire from rubbing the inner fender on the front, and the LCA on the rear.
NOTE: They have no affect on centering the rim, they are .25" thick with holes for the lug studs to pass through and a clearance hole for the hub.

There are two common tire setup's...
1) 225 fronts and 205 rears for grippy surfaces such as concrete. The 205's help the car's tail to rotate.
2) 225's all around for surfaces with less ultimate grip such as asphalt.

I hope this helps, and happy racing.



As soon as you pass the start line, you are only losing time.
Minimize how much time you lose. It's not just going faster, it's
spending less time on the course.

 

When you mention spacers, are these DS legal and up to what point.
I was told that to be competitive at Topeka, you need the 225's up front, so I think that is my plan, but I wasn't aware of spacers. Can you elaborate?
I understand the rubbing aspect, but are we not limited in offset too?

 

Read 13.4 of the stock rules, it states;

same width & diameter
offset within .25" (including wheel spacers if applicable)
resultant change in track is allowed.

From this, you can use .25" spacer's, since the millenia wheels are right on the money for offset.
Without the spacer's, you'll rub on the inner fender (near the front where the lower plastic tray ties in) when you've got the wheels hard over. You should also look into using longer studs, although I'm not sure if that's required.

If you haven't seen it already, check out the autocross guide, it's pretty good.
http://www.itrca.com/FAQ/track/autox.php

If you're located in the NW, let me know and we can try and hook up at an event.

 

Ive run my Millenia and 929 wheels at several autocrosses and 2 days at the Expo. No spacers or anything, Ive had zero problems. They are indeed very light.

 

I just got some 929 wheels and thay are 13lbs each.

 

I will have to look into that...seems interesting.......

 

I dropped the wheels/tires off at the shop for a swap. They don't have a scale, so I'll weigh a wheel/tire combo vs. tire when I get them back later in the week.

Jetydosa; What size tires were you running?

 

Jetydosa has Toyo T1-S on the street and Azenis at Auto-x. Same as myself for AAuto-x and I have Sp9k's.

We each havce a set of 929's and Millenias. Mine weighed 12lbs on the bathroom scale.