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Author Topic:   Backspacing
kar08
Dirt Full Roller

Total posts: 46
posted August 22, 2002 01:55 PM
I'm having a little difficulty in completely understanding how to order a wider rim. My stock rims are 13x5, but I'm not totally sure how to measure backspace or adjust what I need to move up to a 13x7 rim. I know I need to check the clearances with my wheels turned in both directions to compensate for a wider tire, but I'm a little unclear as to how to do that accurately. My buddy told me to attach a paint stir stick to my tire, and leave it hang out from the inside of the tire. I'm not sure how far to hang it out. Should I go the 2 inches that I am attempting to adjust or is there something better to do????

RacnSooner
Dirt Full Roller

Total posts: 39
posted August 22, 2002 03:46 PM
The best way to check back space is to measure from the back side of the wheel to the outer edge of the back of the rim.Hope this helps By the back of the wheel,i mean the part against the hub go from there to the edge of the rim,most13by5 rims are 20r 3 inch backspace

[This message has been edited by RacnSooner (edited August 22, 2002).]

kar08
Dirt Full Roller

Total posts: 46
posted August 23, 2002 10:29 AM
Thanks, Racnsooner!

Do I keep the same backspacing for a 13x7 rim or do I adjust to something else?

SKULLHULL
Dirt Full Roller

Total posts: 69
posted August 23, 2002 01:53 PM
wider is better deepdish less backspacing.good luck

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SKULLHULL

MrEd29
Dirt Roller

Total posts: 8
posted August 30, 2002 06:45 PM
lay the tire flat on its back on the floor take a tape stick thru center read tape at back side of rim got your back spacing , i think wider is better up front, but also do you have a tire width rule at your track or a rim width rule most tracks do. on the left front we run a 6 inch cause you can get them weighing only 11lbs, a 7 inch starts at 13 lbs but if you have to run a 8 inch tire then id run a 6 inch wheel on the front to lower the weight we run 7 on the back . on the front we space them out as far as possible for the wider track and eliminates any clearence problems on calipiers now on the rear if you need more left side weight tuck it in helps gain depending on the car up to 30 lbs more left side weight then we stick the right rear out as far as possible

kar08
Dirt Full Roller

Total posts: 46
posted September 03, 2002 08:33 AM
MrEd, Thanks for the info. Sorry it took so long to reply. I have a 7 inch max tire at the track. I have to run the same size all the way around. I ordered 13 x 7 from Diamond Racing. I got 5 inches of backspace with FWD hubs. My stock 13 x 5 rims have 5 inches and there is little or no clearance inside the wells. I figured pushing the width out would be my safest bet. I'm going to have to experiment a little with spacers to get the right set-up.

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