true or false ??

the back spacing on a wheel will have an affect on the 60' on a car

hell to the no.............

although idealy a wheel with less backspace will use a shorter axle which is less rotating weight.

OK ... so when the wheel is pushed out ( less back space ) you are going to roll on that outer edge of the tire more .... thats his explanation

Backspacing only changes your track width (where the entire contact patch lies)... Not any sort of angle (camber)

It's still going to sit flat no matter where the width is... at least with a solid axle

False. It don't matter where the tire is, as long as it's square to the axle, it will run in the same place. Now a wider track, such as my truck, will tend to pull harder left or right because it has more leverage. Also, when you launch, the tire is "smashed" onto the track and is not round. I don't think squareness, wheel offset, nor anything connected to the tire is going to change the way it contacts the track except maybe a liner or beadlocks.

bruno wrote:OK ... so when the wheel is pushed out ( less back space ) you are going to roll on that outer edge of the tire more .... thats his explanation

who's explanation? Now we are talking backspace, not rim width.............

richter69 wrote:

bruno wrote:OK ... so when the wheel is pushed out ( less back space ) you are going to roll on that outer edge of the tire more .... thats his explanation

who's explanation? Now we are talking backspace, not rim width.............

yes backspace

dude i started to laugh when i heard this but , i then logically listened to his reason ..... and i started to see what he was saying ..... but from what i gathered --- if and only if the car leaned on the launch ... no arb..... but he also said every car does still twist or apply more to the right rear sidewall ...... i dont know .... i need a beer

It still doesn't matter what the backspacing is. The wider the track is, the less it's going to roll over on launch, too. Also, the pinion puts more force on the driver's side tire.

must have been a yellowbullet guy..................

richter69 wrote:must have been a yellowbullet guy..................

nope just one of my techs

does said tech have a fast dragcar? or a dragcar at all? lol.

I can see that maybe shallow back spacing numbers could possibly have a measurable effect on the 60 ft if we are talking about the differences in rotating rear end component weight freeing up some HP & effecting component spool-up time.

But if we are talking about shallow back spacing causing slick "toe-in" during the launch & effecting the 60 ft, that's a different story. Yes, it is in fact possible to cause some given amount of slick toe-in during launch loading with big power & wide wheels with shallow back spacing (say for example a 15 x 15 x 4.00 bs wheel). That's why your seeing bigger axle bearing and/or dual axle bearing setups (without going to a full floater) & SFI rated wheels now days. But I don't think that any small amount of slick toe-in there might be during the launch from bearing loading, axle flange flex, & wheel flex would be enough to offset the benefits of weight reduction from the much shorter housing & axles when using a shallow back spacing.

And any possible slick toe-in effect there might be from bearing loading/flange flex/wheel flex be will become less & less as the rim width choice gets narrower & narrower. So it's a good bet that for example a 10" wide rim's toe-in from increases in possible flex loading (with different shallow back spacing numbers) would be very, very small compared to what a bigger 15 or 16 inch wide rim might be capable of.

In either case a car with a shallow back space number (in either a wide or narrow rim width) would have to have a monster amount of slick toe-in during the launch to really adversely effect the 60 ft numbers. If you had a situation where in fact your slick toe-in was so bad during the launch it effected the 60 ft numbers, you better look for crappy/worn/under sized bearings, bent axles/flanges, crappy wheels, or a bent/bowed housing before blaming the back spacing numbers.

No. But on a different note, more wheel screws or beadlocks will change the 60' on a car, not always for the better either. The claim is they make the sidewall much more stiffer, tire more stable at higher rates of speed. Some cars like it , some don't. Stick cars that are violent on the leave seem to like the stiffer sidewall, and can get a few more passes out of them this way. Commomn part of a tire being wore out is usualy the sidewall giving up and not the tread. JMO.

Travis

TravisRice wrote:No. But on a different note, more wheel screws or beadlocks will change the 60' on a car, not always for the better either. The claim is they make the sidewall much more stiffer, tire more stable at higher rates of speed. Some cars like it , some don't. Stick cars that are violent on the leave seem to like the stiffer sidewall, and can get a few more passes out of them this way. Commomn part of a tire being wore out is usualy the sidewall giving up and not the tread. JMO.

Travis

Travis is right, have seen a set of beadlocked rims slow a car down.