Fitment & Tech Specs
Reference specs for bolt patterns, wheel sizing, and slick dimensions. Not sure what you need? Call 973-334-3470 and we'll help you spec it out.
Tri-Ribb III Sizing & Bolt Patterns
One-piece aluminum, heat-treated to T-6 strength, exceeds SFI 5.1A. Full Polish or Satin Center, with an optional bullet cone center.
| Size | Bolt Patterns | Finish | Price |
|---|---|---|---|
| 15 x 4 | 4½″, 4¾″, 5″, 5½″ | Full Polish / Satin Center | Call for pricing |
| 15 x 6 | 4½″, 4¾″, 5″, 5½″ | Full Polish / Satin Center | Call for pricing |
| 15 x 7 | 4½″, 4¾″, 5″, 5½″ | Full Polish / Satin Center | Call for pricing |
| 15 x 8 | 4½″, 4¾″, 5″, 5½″ | Full Polish / Satin Center | Call for pricing |
| 15 x 10 | 4½″, 4¾″, 5″, 5½″ | Full Polish / Satin Center | Call for pricing |
Call 973-334-3470 for current pricing.
12 Spoke Spindle Mount
Front-runner only. One-piece cast aluminum, heat-treated for strength and a lasting mirror-polished finish.
| Size | Availability | Fits | Finish |
|---|---|---|---|
| 18 x 3″ | Available now | Early Ford, Early Chevy, Total Performance & Anglia-spec spindles | Full Polish / Full Satin |
| 16 x 4″ | Coming soon | — | — |
Accepts disc brake kits including Wilwood and Hurst/Airheart. Price includes races and polished center cap; bearings sold separately.
Slick Size Chart
1-piece design, 4-ply tubeless sidewalls. Our dragster slick (true, smooth tread) is the main tire in every size below. A grooved Cheater version is also available, and can be turned in for the blackwall look. Our special checkered-flag-tread tire is a separate, limited item — call to confirm availability.
| Size | Height | Section Width | Tread Width | Suggested Rim Size |
|---|---|---|---|---|
| 7.75-14″ (Checkered Flag Tread Only) | 26-1/2″ | 8–9″ | 7″ | 14x5.5″ thru 14x8″ |
| 7.75-15″ (Checkered Flag Tread Only) | 26-1/2″ | 8–9″ | 7″ | 15x5.5″ thru 15x8″ |
| 8.20-15″ | 29″ | 12″ | 8½″ | 15x6″ thru 15x10″ |
| 9.00-15″ | 32″ | 12½″ | 9″ | 15x7″ thru 15x12″ |
| 10.00-15″ | 29-1/4″ | 13″ | 10″ | 15x8″ thru 15x12″ |
| 12.00-15″ | 32″ | 15″ | 12″ | 15x10″ thru 15x15″ |
| 9.00-16″ | 32″ | 12½″ | 9″ | 16x7″ thru 16x12″ |
| 12.00-16″ | 32″ | 15″ | 12″ | 16x10″ thru 16x15″ |
Radir slicks are not recaps — every tire is all-new production with correct early/mid-’60s styling. Whitewall width is 2-1/4″ on 7.75″, 8.20″, and 10.00″ sizes, and 2-3/4″ on 9.00″/12.00″ sizes.
Fitment FAQ
Are these recapped tires?
No. Radir dragster slicks (and the grooved Cheater version) are all-new production made with modern materials and construction, built to correct early/mid-’60s sizing and styling.
What's the difference between Dragster and Cheater slicks?
A Cheater Slick is a dragster slick with grooves cut into it — a treaded street look that still runs like a slick. Our checkered-flag-tread tire is a separate, special tire, not offered across every size — call 973-334-3470 to confirm current availability.
How fast do orders ship?
Most orders ship same day. Call or email us, or reach out to one of our authorized dealers, to place an order.
Still Not Sure What You Need?
Call us for any and all fitment questions.