Any benefits of run 15x7 over 15x6.5 when still running the same tyres 195/55/15 R Comps

 

wider is better

 

I think you'd be better off with 15x6.5 on the 195/55-15. Even though they're approved for 15x7, putting them on the max end of their approved range will give them that stretched look and I don't think it does anything for performance.

Who makes an R comp in 195/55-15? I'm not aware of any available in the States.

 

A 205/50/15 will like a 7" wide wheel more than a 6.5". You'll get a better defined "shoulder" on the tire. and the slight increase in track width due to the lower offset is nice to have too.

Not to mention, some performance tires are actually a little wider than their advertised size, so you'll want the extra rim width.

 

I prefer wide 7 or more, because when side walls from tires is outspread the car is more accurate, My friend drive 215/40 R16 on the 9J wheels on street car, comfort=0, drivable=5 !!! I drive on my race car 7J whit 185/570 slick tires

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by chad &raquo;</TD></TR><TR><TD CLASS="quote">wider is better</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Weel &raquo;</TD></TR><TR><TD CLASS="quote">Also lower offset which helps</TD></TR></TABLE>

In terms of positioning the wheel and tire, offset is a function of wheel width. If the wheel is wider, then the offset number needs to be lower, just to position the wheel and tire in the same place (i.e. with the same center line).

 

That tire will perform better on a 7" rim. While it'll work on a 6.5" rim, the wider wheel will be the better choice in terms of laptimes.

Ask anyone who actually runs timed events--wheel width makes more of a difference than some think.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Todd00 &raquo;</TD></TR><TR><TD CLASS="quote">That tire will perform better on a 7" rim. While it'll work on a 6.5" rim, the wider wheel will be the better choice in terms of laptimes.

Ask anyone who actually runs timed events--wheel width makes more of a difference than some think.

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thanks, I will be keeping my 7" rim set and selling one of my 6.5" rims sets. I need to do all I can to get good lap times. Every little bit helps, just trying to get a good setup for next year as everytime I race I change alot of stuff and its hard to get a feel for the car, so setting it up with all new suspension,swaybars etc this year and hopefully just fine tunning

 

im getting some 7.5 inch wide wheels for 195's this season, apparently its the hot thing to do.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jeffhaut &raquo;</TD></TR><TR><TD CLASS="quote">im getting some 7.5 inch wide wheels for 195's this season, apparently its the hot thing to do.</TD></TR></TABLE>

It's also unsafe.

Tire manufacturers publish specs for which wheel widths are approved for use with which tire sizes. The reason they do this is that, if you use wheels whose width is outside this range, it builds up excess stress and heat in the sidewalls, and this can lead to tire failure.

Most 195 treadwidth tires are approved for use on rims 5.5-7.0 inches wide. I do not recommend mounting them on rims wider than the approved range.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jeffhaut &raquo;</TD></TR><TR><TD CLASS="quote">im getting some 7.5 inch wide wheels for 195's this season, apparently its the hot thing to do.</TD></TR></TABLE>

says who?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nsxtasy &raquo;</TD></TR><TR><TD CLASS="quote">

It's also unsafe.

Tire manufacturers publish specs for which wheel widths are approved for use with which tire sizes. The reason they do this is that, if you use wheels whose width is outside this range, it builds up excess stress and heat in the sidewalls, and this can lead to tire failure.

Most 195 treadwidth tires are approved for use on rims 5.5-7.0 inches wide. I do not recommend mounting them on rims wider than the approved range.
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o crap!! id better go phone half of the St* field from the nationals this year that ran the 195 reo1r on a 7.5 wide rim and let them know there tires are gonna blow off

as for who says, the proof is in the pudding man, everyone in ST* runs a 7.5 wide rim with a 205 azenis, with the arrival of the faster re01r they all switched tires to a 195 on a 7.5 wide rim, you look at the results and its pretty clear but which tire is faster. this is all in honda terms mind you, i dont pay attention to what the other guys run, because i drive a honda

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nsxtasy &raquo;</TD></TR><TR><TD CLASS="quote">

It's also unsafe.

Tire manufacturers publish specs for which wheel widths are approved for use with which tire sizes. The reason they do this is that, if you use wheels whose width is outside this range, it builds up excess stress and heat in the sidewalls, and this can lead to tire failure.

Most 195 treadwidth tires are approved for use on rims 5.5-7.0 inches wide. I do not recommend mounting them on rims wider than the approved range.
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I've driven cars with 225's on 5" rims and ive seen cars with 225's on 9.5" rims... and have never heard of one tire failure due to "improper" wheel width.
As far as I know, the recommended widths tire manufacturers publish are just there to give people a reference of what is close to a "normal" fit. I dont think they go around putting their tires on every rim size and test them to see it there is a failure

If you know of anybody who has had tire failures running 195's on a 7.5" rim, please let us know. As jeffhaut mentioned, thousands of people could be in danger right now. Thanks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Autoxjoe &raquo;</TD></TR><TR><TD CLASS="quote">As far as I know, the recommended widths tire manufacturers publish are just there to give people a reference of what is close to a "normal" fit. I dont think they go around putting their tires on every rim size and test them to see it there is a failure</TD></TR></TABLE>

Actually, they do. I was told this earlier this year by tire engineers from Michelin who were at the racetrack. And they really rolled their eyes when I asked them about people who use wheels outside the approved rim width range.

Maybe the RE-01R is an exception, since it seems to be sized more like a 205/50-15 (which is almost always approved for 15x7.5). And I'm sure the risk is worse the further outside the approved range you go (IOW it's worse if you put a 195/50-15 on a 15x8 or 15x9 than 15x7.5).

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nsxtasy &raquo;</TD></TR><TR><TD CLASS="quote">


Maybe the RE-01R is an exception, since it seems to be sized more like a 205/50-15 (which is almost always approved for 15x7.5). And I'm sure the risk is worse the further outside the approved range you go (IOW it's worse if you put a 195/50-15 on a 15x8 or 15x9 than 15x7.5).
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how about a 195 falken all season on a 15x8 wheel on a drift car? or all the crazy euro guys that rock mad stretched tires? as far as performance goes, its kinda weak, but you never see them posting about blowouts.

 

I like my motegi's/rotas at 6 inches 205/55/15 tyres mate! Gday!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jeffhaut &raquo;</TD></TR><TR><TD CLASS="quote">how about a 195 falken all season on a 15x8 wheel on a drift car? or all the crazy euro guys that rock mad stretched tires? as far as performance goes, its kinda weak, but you never see them posting about blowouts.</TD></TR></TABLE>

Just because there are no posts about problems, does not mean there are no problems. I've known a lot of people who did stuff that was not recommended and then ran into problems. They NEVER posted about those problems, because they were too embarrassed, and blamed themselves for ignoring the advice they got. (The only way I found out about it was they told me in person.)

Hey, it's your car, and you can run whatever you want. But this is something you may want to think about when you decide what to run.

 

15x7 front

15x6.5 rear

 

What you should do on the street and what is fastest around a racetrack/autox course are two completely different things; let's not go mixing genres.

This *is* the RR/autox forum and IMO we should go in with that mindset.

With that said, a RE01-R 195 on a 7.5" rim is the fast setup, period. Nevermind that Bridgestone says that a 7" wheel is the max diameter listed. And no one has blown anything out yet.

Bridgestone engineers are usually at a few events I attend, so next year I'll ask their opinion on this. But seeing how they were mounting the 195/50/15 on a 7.5" wheel themselves, my guess is that they'll say it is just fine.

 

lol. I'm running my 195/55/15 Michelin snow tires on 15x7.5" rota slips. It's actually pretty awesome. Snow tires with steering response FTW! I'm not real excited about how exposed the wheel is since the tire doesn't stick out past the wheel at all, but whatever.

BTW, I also ran 195/50/15 RE-01r's on 15x7.5" wheels and won the Pro Finale this year and finished 4th in STS at the Solo nats. Noticeably better then 15x7. I also ran my R with 225 hoosiers on a 6" wheel with no problems and a couple guys at nats had 275 width hoosiers on 6" wheels. Strangely enough, the world didn't end!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by solo-x &raquo;</TD></TR><TR><TD CLASS="quote">lol. I'm running my 195/55/15 Michelin snow tires on 15x7.5" rota slips. It's actually pretty awesome. Snow tires with steering response FTW! I'm not real excited about how exposed the wheel is since the tire doesn't stick out past the wheel at all, but whatever.

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I ran a set of 195/60/15 Bridgestone all-season tires on a 7.5" wheel once, and I was amazed at how the wider wheel transformed even those pieces of junk. From the OEM 6" wheel to the 7.5" wheel was night and day in terms of steering and transitional response.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">BTW, I also ran 195/50/15 RE-01r's on 15x7.5" wheels and won the Pro Finale this year and finished 4th in STS at the Solo nats. Noticeably better then 15x7. I also ran my R with 225 hoosiers on a 6" wheel with no problems and a couple guys at nats had 275 width hoosiers on 6" wheels. Strangely enough, the world didn't end!</TD></TR></TABLE>

I've yet to see the 275 on a 15x6" wheel yet, but it's got to be just as weird looking, or moreso, than the 225 on the 13x5. Better get your tire guy something for Xmas if you want to keep going back for that mount/dismount--especially with the R-comp sidewalls.

And yet we live to talk about it

 

glad im not alone out there

 

Since you guys are on this subject, I have to run 205/50/15 Toyo RA-1 on a 2000 EK Coupe, is it more advantageous to run a 15*7.5 with +40 offset or a 15*7.0 with +28 offset???

Thanks and Cheers

 

my understanding is wider is almost always better as far as rim width goes. i cant see running 12mm more offest being a good thing in the long run, altho it would look really cool.