Depressed after putting 17s on, brb less power, less handling, less braking Options

[bmj67]

I have the 17" tC wheels and 225/45r17 general Altimax HP tires. My car feels a lot better over the stock 15" which wheel/tire weighed in at 37lbs. I haven't weighed the wheel/tire combo but I know the tC wheel alone is about 21lbs and if I can go by the manufacturer specs the tire should weight about 20 lbs. Which would mean id be looking at 41-42lbs overall. In your case the wheels are where the majority of the weight will be gained or lost. I don't think just changing tires will give you what you want.

[Keiri]

I have the 17" tC wheels and 225/45r17 general Altimax HP tires. My car feels a lot better over the stock 15" which wheel/tire weighed in at 37lbs. I haven't weighed the wheel/tire combo but I know the tC wheel alone is about 21lbs and if I can go by the manufacturer specs the tire should weight about 20 lbs. Which would mean id be looking at 41-42lbs overall. In your case the wheels are where the majority of the weight will be gained or lost. I don't think just changing tires will give you what you want.

That's the same brand and make of tire that I'm running but a tad wider. Does it feel more planted at speed than the stocks to you? For me the Altimax HPs grip better wet and dry than the Ecsta ASXs or Yokohama AVID 4S I was running on the stock 15s.

[bmj67]

I haven't driven in the wet yet just got them put on Saturday. But so far I love them. They ride really smooth and stick in the turns.

[stephen_lee]

1lbs of rotation mass(wheels) = 10 pounds dead weight

so if u go fron 15lbs rims to 20 lbs rims its like adding 200lbs of sand bags to your car.. or the average weight of one adult

[Keiri]

1lbs of rotation mass(wheels) = 10 pounds dead weight

so if u go fron 15lbs rims to 20 lbs rims its like adding 200lbs of sand bags to your car.. or the average weight of one adult

QFT.

And I can really feel it when passing or once I've added another person in the car - acceleration drops and fuel consumption rises. Come winter I'm putting the 15s back on...

[bmj67]

1lbs of rotation mass(wheels) = 10 pounds dead weight

so if u go fron 15lbs rims to 20 lbs rims its like adding 200lbs of sand bags to your car.. or the average weight of one adult

That's not 100% true. It depends on where the weight is added from the center axis. You can take wheel A and put a 2lb weight near the center axis and wheel B with 1lb on the outside edge and wheel A will still accelerate faster than wheel B even though it has more weight. Yeah both will accelerate slower than a wheel with no added weight but it won't be like adding 10lbs to every 1lb. At most maybe 2-3lb to 1

[stephen_lee]

true it does take more energy to spin weight further from the center axis.

[Mycurse180]

1lbs of rotation mass(wheels) = 10 pounds dead weight

so if u go fron 15lbs rims to 20 lbs rims its like adding 200lbs of sand bags to your car.. or the average weight of one adult

Don't buy this for a second.

[Galcobar]

1lbs of rotation mass(wheels) = 10 pounds dead weight

so if u go fron 15lbs rims to 20 lbs rims its like adding 200lbs of sand bags to your car.. or the average weight of one adult

That's not 100% true. It depends on where the weight is added from the center axis. You can take wheel A and put a 2lb weight near the center axis and wheel B with 1lb on the outside edge and wheel A will still accelerate faster than wheel B even though it has more weight. Yeah both will accelerate slower than a wheel with no added weight but it won't be like adding 10lbs to every 1lb. At most maybe 2-3lb to 1

However, for our purposes the additional mass is almost always at the outer edge. The wheel will have longer spokes, but the majority of the additional metal will be in the barrel, to which the tire mounts. The wider and stiffer tire (more rubber and a denser formulation) comes with a higher weight as well, and this is even further out towards the edge of the rotational mass than the wheel's added weight.

Plus-sizing isn't just a matter of putting on heavier wheel/tire combinations. It's also about moving the weight farther out from the centre of the rotating mass. It's a double-whammy: higher weight, higher leverage. It's the inverse of the same principles which make longer wrenches capable of multiplying the same force. Foot-pounds -- plus sizing increases both sides of that equation.

This post has been edited by Galcobar: Jul 29, 2011 - 1:41 AM

[delusionz]

ive had 14" steelies (not on the gt4 obviously) and i couldnt curse them enough, in the wet the car skids, slides, understeers, scares the sh*t out of me...

never weighed my factory gt4 16's , but just in comparison by holding each one, my oz cronos are heavier... didnt notice a difference in performance, but then again ... lol it's no 5sfe under the hood

[ricochet1490]

I'm also rolling 215-40-17's on mine. I didn't notice any difference at all from stock wheels. In fact, my .02 is that unless you are under full throttle at every stop light, you won't notice a difference for DD work... at least I didn't. But my car HANDLES so much better with the 215's on it, I figure whatever I lose in mileage upon acceleration I can make up in maintained speed through corners. I don't plan on going back to the stockies anytime soon. And if you get the right sized tire, you'd be in there.... yours are a little tall right now... 205/45's or 215/40's are what I would run as most people have already pointed out lol

[Needles]

Splash out on some volks

My 18" Ce28N weigh in at 6.7kg (14.7lbs)

lol mine is enkei rpf1 17" , (15.5lbs)
and its way better than the stock wheel,
handling, braking , accelerating better

it also have super soft tire that never slip since i had it, 215/45/17

MAT PROCESS: Shaping by the MAT process reduces wheel weight by 10%-15%. Every pound of unsprung weight savings has the effect of reducing overall vehicle weight by 20lbs. F1 REPLICA: Enkei is an official supplier of the McLaren Mercedes Formula One Team. The RPF1 was developed using the same technology as the Formula One race wheel. TWIN SPOKES: Enkei's dual open stance spoke design is used on the McLaren Mercedes Formula One race wheel. The twin spokes achieve better stress dispersion on curves, hard braking, and extreme race driving. CENTER DESIGN: Enkei's pocket design around the bolt circles increases rigidity and keeps the wheel cooler during aggressive race driving.



This post has been edited by Needles: Aug 29, 2011 - 10:56 AM