Front tire size versus reaction time

[7423]

Currently running 27.5 Mickeys and need to pick up my lamp a couple three hundreds. Thinking about a pair of 25's or 26's. Any thoughts on what that change will net me?

[partsbob67]

they make the car faster.... less money in the wallet= less weight!!!!

[Michael Beard]

2" diameter will get you roughly .015.

I wrote a rather long editorial for ThisIsBracketRacing.com that covers that and numerous other ways to change your R/T's.

[7423]

Originally Posted by Michael Beard

2" diameter will get you roughly .015.

I wrote a rather long editorial for ThisIsBracketRacing.com that covers that and numerous other ways to change your R/T's.

Thanks for the reply Michael, do you have the link for that editorial?

[Michael Beard]

I do, but it is a 'pay' subscription site. You have to be a member to read the site's content. It's WELL worth it, though! The other info on the site has helped me win a bunch of specific important rounds this year.

My editorial is at: http://www.thisisbracketracing.com/g...s=58530B010301

[Tim Kish]

I'm sure Michaels editorial covers it but one key consideration is if your car goes forward or straight up. If you are jerking the tires up outta the beams, diameter isn't going to help.

[Adger Smith]

Sometimes a tire that is quite a bit shorter will change the weight bias/suspension set up of the car so much it will make the car leave slower. To do a valid comaparison of RT/tire height you have to maintain the ride height on the car the same, or as close as possible, for both tests.

[sprnova]

I tried the same thing thinking mt RT would be better for a pro light. I was wrong. It actually made it worse and the car slowed down. I think it was because it made the motor pick up the front end from further down then normal. As someone already said. It changes the ride height. As for making the car faster, wouldnt it slow it down by putting a small tire? Less run out = slow ET More roll out = a quicker et. ( more of a run at it)

[Adger Smith]

I think you assumptions on your car are correct. "If" the car leaves the same... Back to ride height... the shorter roll out tire should make the reaction time quicker. It will also decrease the ET a little due to the reduced rollout... Think of Roll Out as a distance where you gather FREE speed before breaking the beams. How much free speed you get depends on many variables... Rear tire/suspension/converter hit/and just how hard your combination leaves all play roles in RT and ET's. That is why some say .005 and others say .015 with different tire sizes. Some other component of your suspension/weight bias or even tire slippage/hit changed when you put on the smaller tires.