I'm looking for some lightweight steel wheels for track use. I have seen several posts concerning the use of concentric rings to adapt the center bore to match the Fiero (88) hub. I haven't run into that concern before. I can certainly order some Basset or Diamond wheels, but what do I need to know about the center bore?

The wheel center-bore size on a fiero is 57.1mm.

Bolt pattern is 5x100mm (or 5x3.94") and the studs are 12x1.5.

Please try to get the correct bore, so the wheels are correctly hub-centered instead of lug-centered.

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Currently in the middle of my 88 + 3800NA swap

57.1 mm (or 2.25")

Edit - looks like aaronkoch beat me to it.

[This message has been edited by fieroguru (edited 09-26-2011).]

Thanks Aaronkoch. I appreciate the specs. I just had not run into the situation where this was a real concern. Most racing wheels just don't even mention the center bore specs. BTW, nice choice of wheels and tires on your build. How did the final fit work out with the tire size?

Having matching center bore is probably best, but you can use hubcentric rings if you have to with an over-sized center bore.

This is becoming more complicated. I was hoping to just order a couple 16x7 wheels from Basset or Diamond. Nice lightweight steel wheels. Cheap. Now I find myself expanding the search for other stock (again, read cheap) wheels that might be available for this track car. Appearance? not so much a concern. This is after all a LeMons/Chumpcar.

quote Originally posted by DonP: Thanks Aaronkoch. I appreciate the specs. I just had not run into the situation where this was a real concern. Most racing wheels just don't even mention the center bore specs. BTW, nice choice of wheels and tires on your build. How did the final fit work out with the tire size?

Haven't driven with them on my car yet, but I loaned them to Joe for his car for fiero fest 2010..



More pics here.
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Currently in the middle of my 88 + 3800NA swap

[This message has been edited by aaronkoch (edited 09-26-2011).]

quote Originally posted by DonP: This is becoming more complicated. I was hoping to just order a couple 16x7 wheels from Basset or Diamond. Nice lightweight steel wheels. Cheap. Now I find myself expanding the search for other stock (again, read cheap) wheels that might be available for this track car. Appearance? not so much a concern. This is after all a LeMons/Chumpcar.

As long as you have tapered lug nuts, tapered lug nut seats on the wheels, and take care while tightening them, you can run the wheels lug centric vs. hub centric. Where hub centric becomes an absolute requirement is on wheels that do not use tapered lug nuts.

quote Originally posted by DonP: This is becoming more complicated. I was hoping to just order a couple 16x7 wheels from Basset or Diamond. Nice lightweight steel wheels. Cheap. Now I find myself expanding the search for other stock (again, read cheap) wheels that might be available for this track car. Appearance? not so much a concern. This is after all a LeMons/Chumpcar.

Don't forget the offset!

quote Originally posted by Stubby79: Don't forget the offset!

yup. I've been trying to understand that diagram/chart that has been referenced numerous times her. Keep forgetting that 88 is different.. But I'm learning.!

quote Originally posted by Stubby79: Don't forget the offset!

The range 30mm to 38mm is typically what is chosen for Fiero wheels.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, ZZP Intercooler, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

Long ways off, but maybe these will help: http://athensga.craigslist.org/pts/2620524972.html (Grand Am - I have no idea if they'll fit or what size they are)
~ Paul
aka "Tha Driver"

Custom Fiberglass Parts

Most race series (roundy track) I used to race in even 30 years ago, usually wanted you to have hub concentric wheels. The car weight is carried by the hub and axle. You dont want your wheel to depend just on the lug nuts. I had some non conforming wheels on my T bird once and track tech inspector told me it was OK that week, but had to be spec from then on.

Thank you Tha Driver. I'm looking for options now. I have found a thread referencing Grand Am and Beretta wheels in 16x7 size.

Roger, I agree on the hub centric requirement. In a racing situation I want maximum support. So I am definitely willing to buy adapter rings if needed. But I haven't run into a situation requiring any such concern in my past roundy-round and road racing efforts. That was driving '69-'70 Mustangs or tube frame chassis. Oh well, different venue, different hardware........

quote Originally posted by fieroguru: As long as you have tapered lug nuts, tapered lug nut seats on the wheels, and take care while tightening them, you can run the wheels lug centric vs. hub centric. Where hub centric becomes an absolute requirement is on wheels that do not use tapered lug nuts.

Yes but remember you can't load wheel to stop from turning etc... Mean you can't lower car w/ a jack etc to stop wheel turning... Much loading will interfere w/ lugs centering.

I also carry a cheap beam type torque wrench... easy to use and easy to tighten, even w/ one hand.

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