caramall2 Posted March 2, 2009 Share Posted March 2, 2009 Buying Dunlop Z1. Kind of chickening out on 245 as several say I'll have rubbing issues--definitely don't want that (I'm on Zeals, lowered about 3/4"). I've read tons of threads on this...mixed reviews. So, my next question is: Do you think 235/40 is a good adv handling wise over 225/45? I like the extra protection of the higher side wall, but would like to try some wider tires (running 225/45 summer high perf now). Link to comment Share on other sites More sharing options...
devobuzz Posted March 2, 2009 Share Posted March 2, 2009 Comparing the same summer tire in both sizes, I don't think you'll notice much difference between the two on the street. It's more for looks than anything. Link to comment Share on other sites More sharing options...
whitetiger Posted March 2, 2009 Share Posted March 2, 2009 you wont have rubbing issues with 245/40/17 on a 17x8 rim. i run 245 wide on a 2" lowered car and i dont rub (after proper alignment with good camber). A mild fender roll will make sure you dont rub. Link to comment Share on other sites More sharing options...
Guest Posted March 2, 2009 Share Posted March 2, 2009 I researched this issue long and deep. I decided to stick to 225/45/17 so to avoid any rubbing/fender rolling. I also found comments by people on this forum who tried both and said 245 are great for autox, but 225 are better on the street. Since my cars spend majority of their time on the street I stayed with 225/45/17. Plus I could not find sensibly priced 17x8 wheels I'd like. Remember that wagons leave slightly less outboard clearance in the rear, so wheel/tire combo that doesn't rub on sedan may rub on wagon. Link to comment Share on other sites More sharing options...
whitetiger Posted March 2, 2009 Share Posted March 2, 2009 aside from the fender clearance issue, why would 225/45/17 be better than 245/40/17 on the street? the total sidewall heights are within 3mm of each other, and the 245/40/17 is closer to the stock 215/45/17 tire diameter. I say if you can make it fit, the wider the tire, the better, unless its in the snow Link to comment Share on other sites More sharing options...
Guest Posted March 2, 2009 Share Posted March 2, 2009 I am not sure about the wider always the better. Seems like steering response may suffer. Added weight is not a plus either. Wider is better when cornering. With sticky 225/45/17 it's not quite easy to reach their limit of adhesion on the street anyway. I try, but usually it's beyond what most would call crazy Link to comment Share on other sites More sharing options...
whitetiger Posted March 2, 2009 Share Posted March 2, 2009 steeing response improves since there would be more front end grip due to more tire on the ground. steering weight at low speeds would increase alittle for obvious reasons. you arent trying hard enough then. i can get to the limit often if i want, and im on re-01rs 245 wide on the street. Link to comment Share on other sites More sharing options...
caramall2 Posted March 2, 2009 Author Share Posted March 2, 2009 Thanks guys. Whitetiger, what's your suspension again (coilovers, springs, etc)? Link to comment Share on other sites More sharing options...
Bolksey85 Posted March 3, 2009 Share Posted March 3, 2009 I'm glad I found this as I've been running over this same basic subject in my head lately. I've been having dreams of summer wheels soon and am not quite sure what to do. I live in Potholeville, AKA, Pennsylvania. The extra sidewall of 225/45 plus tire pricing, availability, and weight seems the best choice to me. I'm not even close to an aggressive driver and when I do do it, I should have good enough rubber to not need the extra 20mm of width. Add in cheaper wheels and no issues with rubbing and I'm happy. Now a question though. I see a few people on here run a 235/40 on a 17x7.5. How does that size fit in with sidewall protection, rubbing, and the possible need for rolling fenders? Link to comment Share on other sites More sharing options...
whitetiger Posted March 3, 2009 Share Posted March 3, 2009 Thanks guys. Whitetiger, what's your suspension again (coilovers, springs, etc)? tien flex coilovers, heavily lowered for a street car. but witht he rght offset rim, 245 wider tires fit with no issue. not sure about the differences in fender clearance with a wagon. Unclemat would know more about that, but on a sedan, no issues. Link to comment Share on other sites More sharing options...
LittleBlueGT Posted March 3, 2009 Share Posted March 3, 2009 You guys realize that not all 245 section width tires are the same width, right? The Star Specs are considerably wider then most tires of the same section width. Full tune of 68HTA, KSTech 73 MAF, Racer X FMIC and ID1000s................by the DataLog Mafia!!! Link to comment Share on other sites More sharing options...
Guest Posted March 3, 2009 Share Posted March 3, 2009 Correct. My 225/45/17 Z1s are touch wider than RE050A PP I have on the other wagon. Link to comment Share on other sites More sharing options...
big lou Posted March 3, 2009 Share Posted March 3, 2009 caramall2: what are your wheel offsets? This may dictate if you're going to rub or not. Last season, I ran a 235/40/17 (Toyo RA-1) with a 17x8 45mm offset (Enkei RPF1) with no rubbing. But this was for autox and track days. My street tires are 225 on 8" rims. Link to comment Share on other sites More sharing options...
LittleBlueGT Posted March 3, 2009 Share Posted March 3, 2009 Correct. My 225/45/17 Z1s are touch wider than RE050A PP I have on the other wagon. Happy with em? How do they ride? Full tune of 68HTA, KSTech 73 MAF, Racer X FMIC and ID1000s................by the DataLog Mafia!!! Link to comment Share on other sites More sharing options...
Guest Posted March 3, 2009 Share Posted March 3, 2009 Happy. Sticky like glue and don't get greasy on the track. On the stiffer side, but not too stiff. Wear surprisingly slowly for the abuse they went thru. Kinda noisy. Link to comment Share on other sites More sharing options...
JoeFromPA Posted March 3, 2009 Share Posted March 3, 2009 As has been pointed out....bigger tires means: 1. More rotating mass (typically) 2. More stress on the steering/suspension 3. Can reduce braking capabilities 3. Less snow traction vs. equal tire with smaller width 4. Less resistance to hydroplaning. 5. More road noise (agian, vs. an equal tire with smaller width) I'm not saying it's a bad idea. Just things to weigh when you consider this. Joe Link to comment Share on other sites More sharing options...
whitetiger Posted March 3, 2009 Share Posted March 3, 2009 As has been pointed out....bigger tires means: 1. More rotating mass (typically) 2. More stress on the steering/suspension 3. Can reduce braking capabilities 3. Less snow traction vs. equal tire with smaller width 4. Less resistance to hydroplaning. 5. More road noise (agian, vs. an equal tire with smaller width) I'm not saying it's a bad idea. Just things to weigh when you consider this. Joe 1. if you find a lighter wheel, you can save mass even thouigh the tire is wider. my setup is like this, lighter than stock 2. in motion, a lighter wheel/tire combo will have less tress on the steering. although one can argure that more grip in general has more stress ont he car, but that is to be expected, and is in essence the whole point of a wider tires. better grip. 3. a lighter wheel/tire comber with more rubber on the ground due to a wider tire will improve braking, not make it worse. 3(again). agreed. this is why its nice to have dedicated winter and summer setups. 4.the right tire selection will make he difference between a narrow tire and wide tires very little in terms of hydroplaning threshold 5. agreed, but if you are compaing the same exact tire, just 2 different widths, the difference in road noies will be almost nothing unless you are comparing a 195 wide tire to a 295 tire. the real world variables that would cause someone not to get a wider tire are cost and fitment. Link to comment Share on other sites More sharing options...
JoeFromPA Posted March 3, 2009 Share Posted March 3, 2009 1. A tire represents the greatest rotating mass in the drivetrain, due to it's distance from the hub. A lightweight wheel will not overcome a heavier tire, unless you are a physics major and actually do the calculation and i'm wrong. 2. A heavier tire will put more stress on the suspension because it needs to deal with more weight. It's probably granny smith apples vs. roma apples. I'll retract what I said about steering, since it's pretty much all argumentative. 3. I won't argue that in a 60-0 test that a wider tire could offer benefits. What I have observed in my transition from an 18 pound tire to a 25 pound tire (same tire size), is that braking effort is significantly increased. Take that for what it's worth. 4. Like I said, examining the same tire. I'm not saying it's going to be the difference between cruising through 3 feet of water or going waterskiing; just that it is a difference to consider. 5. Same here. 6. I'll add one: A wider tire means you have increased the frontal area of your vehicle. You will meet more wind resistance. Joe Link to comment Share on other sites More sharing options...
VTGT Posted March 3, 2009 Share Posted March 3, 2009 I will be be happy with my 235/40/18's seems to be a nice compromise between 225 and 245 haha. Link to comment Share on other sites More sharing options...
devobuzz Posted March 3, 2009 Share Posted March 3, 2009 Just to bring the discussion back to the original post: Do you think 235/40 is a good adv handling wise over 225/45? I like the extra protection of the higher side wall, but would like to try some wider tires (running 225/45 summer high perf now). I don't think you will notice much difference between the two... Link to comment Share on other sites More sharing options...
caramall2 Posted March 4, 2009 Author Share Posted March 4, 2009 Thanks again all. Interestingly, for cross-section (not sure what contact patch width is) for Z1: 225/45/17 (7.5" rim) -- 8.9 235/40/17 (8.5" rim) -- 9.6 May have more to do with the rim width (1" difference) than the tire width...not sure. Link to comment Share on other sites More sharing options...
caramall2 Posted March 4, 2009 Author Share Posted March 4, 2009 Oh, I have 48 mm offset. Link to comment Share on other sites More sharing options...
LittleBlueGT Posted March 4, 2009 Share Posted March 4, 2009 235/40/17 (8.5" rim) -- 9.6 And a Dunlop SP Sport FM901 on an 8.5 inch rim is 9.3 inches. Same size. Full tune of 68HTA, KSTech 73 MAF, Racer X FMIC and ID1000s................by the DataLog Mafia!!! Link to comment Share on other sites More sharing options...
big lou Posted March 4, 2009 Share Posted March 4, 2009 Oh, I have 48 mm offset. You'll be fine with either: 225/45/17 235/40/17 (if anything, remove the rear rubber strip around the wheel well to give you a little more room) Now the choice is really up to you and what you want to do. I don't think you'll notice a difference in handling (especially on the streets) but you will notice the gearing difference. Link to comment Share on other sites More sharing options...
LittleBlueGT Posted March 4, 2009 Share Posted March 4, 2009 You'll be fine with either: 225/45/17 235/45/17 235/40/17 or 245/40/17 (if anything, remove the rear rubber strip around the wheel well to give you a little more room) Now the choice is really up to you and what you want to do. I have 235/40/17s on 48 mm positive offset. I had rubbing with the rubber strip on my car, now with the strip taken off I do not rub. What makes you think that 245/40/17s will now fit? Especially on a wagon? And especially with tires known to have a wider then normal profile? Full tune of 68HTA, KSTech 73 MAF, Racer X FMIC and ID1000s................by the DataLog Mafia!!! Link to comment Share on other sites More sharing options...
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