GMVPSS
Active Member
- Joined
- Jan 31, 2009
- Messages
- 183
- Reaction score
- 155
- Points
- 43
- Location
- Melbourne
- Members Ride
- VFII Redline Wagon, 7sec Pontiac GXP, VY Ute
Getting my car ready to race at the Holden Nationals and thought I'd take advantage of having wheels around the house and weigh them.
Only used bathroom scales, so please use as an indication only. All tyres brand new and full tread depth.
VF SS 19" Factory rim with Bridgestone 245/40R19 = 25.0kg
HF20i Option wheel with Bridgestone 245/35R20 = 25.0kg
Racestar 18 x 5 rim with Mickey Thompson 26 x 6 R18 Sportsman Pro = 16.5kg
Koyo Forged 18 x 10 rim with Mickey Thompson 285/40R18 Drag Radial = 22.5kg
We can assume the 275/30R20 rears would be a little heavier than 25.0kg and I will confirm their weight when I get one off the car in the coming week or so.
Interesting was the fronts being 8.5kg each (17kg total) lighter. In a back to back test on a mustang in the USA they went 0.09sec faster to 1/8th mile with the lighter and skinnier (less rolling resistance) front tyres.
Check this out for a read. http://www.dragzine.com/tech-storie...ootout-18x9-5-versus-18x4-5-at-the-dragstrip/ Their front weight saving was also around 17kg.
In theory, a half track improvement of 0.09sec should be around 0.15 at the 1/4 mile!
I haven't raced the car yet in either configuration, but something interesting to think about!
Only used bathroom scales, so please use as an indication only. All tyres brand new and full tread depth.
VF SS 19" Factory rim with Bridgestone 245/40R19 = 25.0kg
HF20i Option wheel with Bridgestone 245/35R20 = 25.0kg
Racestar 18 x 5 rim with Mickey Thompson 26 x 6 R18 Sportsman Pro = 16.5kg
Koyo Forged 18 x 10 rim with Mickey Thompson 285/40R18 Drag Radial = 22.5kg
We can assume the 275/30R20 rears would be a little heavier than 25.0kg and I will confirm their weight when I get one off the car in the coming week or so.
Interesting was the fronts being 8.5kg each (17kg total) lighter. In a back to back test on a mustang in the USA they went 0.09sec faster to 1/8th mile with the lighter and skinnier (less rolling resistance) front tyres.
Check this out for a read. http://www.dragzine.com/tech-storie...ootout-18x9-5-versus-18x4-5-at-the-dragstrip/ Their front weight saving was also around 17kg.
In theory, a half track improvement of 0.09sec should be around 0.15 at the 1/4 mile!
I haven't raced the car yet in either configuration, but something interesting to think about!