chenc544 Posted April 28, 2007 Share Posted April 28, 2007 Finally gotten around to take some pictures. Link to comment Share on other sites More sharing options...
Gire Posted April 29, 2007 Share Posted April 29, 2007 Those tires look pretty beefy. What are the specs of the wheels and tires? Link to comment Share on other sites More sharing options...
chenc544 Posted April 29, 2007 Author Share Posted April 29, 2007 They are 225/45/17 ContiExtremeContacts. The Kosei are 17x8 and they weight 15.5 lbs. I wanted to get the 17x7, those weight ~14 lbs, but they were out of stock when I wanted them. Link to comment Share on other sites More sharing options...
urfsin Posted April 29, 2007 Share Posted April 29, 2007 Those tires look pretty beefy. OH YEAH, just the way I like them... Slide It Sideways Link to comment Share on other sites More sharing options...
mechdiff Posted April 30, 2007 Share Posted April 30, 2007 Very nice, I got the same ones but the 7 inch wide model. I swear I am getting better gas mileage with these things. Even the tire shop commented on how light they were. Link to comment Share on other sites More sharing options...
chenc544 Posted April 30, 2007 Author Share Posted April 30, 2007 Very nice, I got the same ones but the 7 inch wide model. I swear I am getting better gas mileage with these things. Even the tire shop commented on how light they were. It's the whole rotating mass factor. I have heard various rule of thumb from 4:1 to 10:1, whatever it is the butt dyno can tell the difference. I weighted the wheel tire package and it was ~35.5 lbs compare to ~42 lbs for the OEM/RE92. Link to comment Share on other sites More sharing options...
hyteck9 Posted May 1, 2007 Share Posted May 1, 2007 I just got the 18" version at 15.9 lbs each. Rotating mass is usually an increase by 3x in respect to car wheel&tires (radius/velocity/etc all play a part) More importantly I think... is the reduction in unsprung weight on the suspention... (better transitional handling) AND the reduction in gyroscopic forces from the reduced rotational mass (heavier spinning wheels are more inclined to continue spinning straight so lighter means easier to stear). Just 42 lbs for the OEM? thought it would be even higher then that. I'll post the weight of my 18" wheel tire package as soon as the F1 GS D3's are mounted. should be a few under 30 lbs if those beefy tires you have chimed in at 35.5! :-) Link to comment Share on other sites More sharing options...
chenc544 Posted May 1, 2007 Author Share Posted May 1, 2007 Just 42 lbs for the OEM? thought it would be even higher then that. The OEM 17" weights 19-20 lbs and TireRack has the RE92 at 23 lbs so that comes out to ~42 lbs. Give a take a little for the 20k mile tire wear. I was really surprised by how accurate the TireRack number turned out. Link to comment Share on other sites More sharing options...
IwannaSportSedan Posted May 1, 2007 Share Posted May 1, 2007 I was under the impression that the OE 17" wheel was closer to 21-22lbs... but I could be wrong. Link to comment Share on other sites More sharing options...
Legacy_GT_Pilot Posted May 2, 2007 Share Posted May 2, 2007 I just weighed my rims as well, and noticed the same 6.5lb improvement. My stock rims with winter tires came in at 44.0lbs, whereas my RP-F1's and Kumho SPT's (215/45/17) came in at 37.5lbs. My scale must be a little off compared to yours. Dave ________ Maine medical marijuana dispensary Link to comment Share on other sites More sharing options...
chenc544 Posted May 2, 2007 Author Share Posted May 2, 2007 I just weighed my rims as well, and noticed the same 6.5lb improvement. My stock rims with winter tires came in at 44.0lbs, whereas my RP-F1's and Kumho SPT's (215/45/17) came in at 37.5lbs. My scale must be a little off compared to yours. Dave Kumho SPT weights in at 22 lbs according to TireRack and 17x7 RP-F1 is about 15.2 lbs according to EdgeRacing so that makes it about 37.2 total. I think your scale is about right. What kind of winter tires were you running? From my search even tires of the same size could have weight difference of well over 5 lbs. Part of the reason I went with ContiExtremeContact is because it's 20 lbs vs RE960AS at 26 lbs and M550 at 27 lbs. Link to comment Share on other sites More sharing options...
Legacy_GT_Pilot Posted May 3, 2007 Share Posted May 3, 2007 My winters are Hankook something or other, and they are on the beefy side. Dave ________ Replica Double Eagle Automatic Electric Link to comment Share on other sites More sharing options...
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