[aufoxy]

I have another set of the stock 16x6.5 in wheels for my 02 toyota celica that I put r compounds on for autocross (I compete in stock class so I didn't want to change wheel size).. This year I want to buy 225/50 16 kumho v710s for it, since that is the smallest size they make for the 16x6.5 in wheels that will fit. Has anyone tried this tire size for these wheels? Do they fit without causing problems? Also, I'm running -2.25 degrees of camber on the front (crash bolts), but that is adjustable. I was wondering if anyone had tried a similar setup and could tell me if this tire size had worked on their car. Thanks!

 

[renfield90]

As far as I know, that will fit without issues. Others have run a 225/45/15 just fine and I can't imagine these could be any worse.

 

[GSBoek]

It's still within the 70% rule (the wheel is 73% of the tire width) so it will fit, it's not ideal though.

 

[conehugger]

A guy runs them locally on a 2003 celica. The gearing is better for the 15 inch rims, but the 16's worked without any issue.

 

[boxologist]

ITRs have been fitting 275s on a 6.5" wheel.

 

[aufoxy]

Thanks guys! Wow, 275s on the 6.5" wheel?? That's crazy!

 

[solort]

245/45-16s will work well on the wheel (that's what I run on my Mazda3 with 16x6.5 wheels). See ya at TNT Sat...

 

[mrbarky]

So I would be fine running 215/45/16's? I didn't want to make a new thread so I figured I'd ask here.

 

[LeMansCelica00]

225 45 R16 stock GTS rims... Falken Azenis amazing grip comfortable road cruzing... fun

 

[conehugger]

The 215/45R16 should fit. I run them on a 7.5 inch rim and the rim is too big for them.

 

[mrbarky]

The 215/45R16 should fit. I run them on a 7.5 inch rim and the rim is too big for them.

Thanks, I think I'm going to order them then.

 

[LeMansCelica00]

the 225's act like 235's when they get heat in them and they cost 86 a per at tire discounters 215's will work but the wider the better for the track... raceing is all that matters though... learn to drive with what you equip...

 

[conehugger]

Sorry LeMansCelica00, I do not agree with your logic. Wider is not better on a smaller rim. Wider might be better on a wider rim up to a point. Take a look at the Civics running 195 instead of the 225. If the sidewall is not stiff enough to support the extra weight then the tire kind of collapse when it is fully loaded. You then have to run so much pressure to keep the sidewall from collapsing that the flat part of the tire becomes round further decreasing grip. Not sure about the new version\compound of the 615 that is not released yet, but there are so many faster tires out there than the current version of the 615. The re01r was faster than the 615 and the re11 are faster than the re011r.

 

[renfield90]

there are so many faster tires out there than the current version of the 615.

Fully agreed. Width is important, but not everything.

I switched from the 205/50/15 of the current Azenis 615 (which was really wide and meaty for a 205) to the 195/55/15 Direzza Z1 Star Spec (which measures exactly 195 and is kinda puny). I'm faster on the Direzza, and overall I find it's a much easier tire to drive on. You'd have to pay me money to switch back to the Azenis.

In addition to the Direzza, the RE-01R and the RE-11, there's also the Kumho Ecsta XS, which is faster than the Azenis. There's a reason they're updating the 615s, they're just not cutting it anymore.

 

[solort]

You are comparing apples to oranges.

If you look at the fastest autocrossers at a National event, they will fit the widest tire possible on their rims and go faster. If you compare the same model tire in a narrower vs wider size on the same rim on the same car with the same driver, the wider tire will almost always be faster. If you compare a stickier narrower tire to a wider tire that is not as sticky, the narrower tire may be faster. The Azenis is no longer a contender....

 

[renfield90]

If you compare a stickier narrower tire to a wider tire that is not as sticky, the narrower tire may be faster.

Not sure if you were replying to me, but that was my point. The performance gap in the compounds is enough to negate the advantage of the wider tire - at least in the case of the Azenis vs. Direzza, RE-01R, et al.

 

[The Kev Master]

I've done all the testing till I'm black and blue.

I have tested the Hoosier A6 205/45-16, 225/50-16 and the 245/45-16.

All on a 16x6.5" wheel. The way a GTS is geared, the best tire is the 205/45-16 is the best tire. The 225/50-16 and the 245/45-16 were comparable in times but the 205/45-16 was about a second faster.

So far the only guys posting here who have made any sense and actually know what they're are talking about is ConeHugger and Renfield90.

SoloRT, there's a lot more factors going to into your logic than you have explained.

Yes, the ITR guys used 275/35-15s but they have also told me that they go just as fast on 225/45-15s just that the 275s offer better heat management with two drivers but if there's just one driver, they typically prefer to do the 225s.

All cars have different designs and different philosophies surrounding their setup, hence each car will react differently to different changes. I have three sizes as I followed contemporary wisdom but have found this out after doing back to back testing at a test and tune session.

If he's running a GTS, I'd recommend getting a set of 15s as the 15s would weigh less than the 16s and getting a set of Hoosier 205/50-15.

If you're going to run the 16s, get a set of 205/45-16.

If you're going to insist on buying V710s, get either a 205/50-15 if you're getting 15s rims or get a 215/40-16 for the 16s.

 

[solort]

I didn't even go into the way you can improve rear rotation by using either a narrower tire or the same size but less sticky tire (same model but more heat cycles, older build date or more tread) in the rear...

Or by raising rear tire pressure till tire has smaller contact point (and increases effective spring rate)

 

[LeMansCelica00]

Sorry Conehugger i was mistaking i am running 215's i have not looked at my car all winter... but you are right... i just like the compound. i love the stiff sidewall... any help you can give me on suspension set ups and things like that would cool... i have been running auto cross events at my school for the past year and have been going to Nelson Ledges in Ohio for years but have been running my uncles Corvette.

 

[conehugger]

All good information. You guys really need to specify which class you want the tire for. My DZ101 are a great tire for the street, cause it is cheap, and sticky for cheap stock size tire. It has a big sidewall so my stiff springs don't kill me as much on the street. Would I ever autocross the tire? No way.

Stock class, wider is not better if it is also taller. Wider and same diameter works up to a point that the tire can be too big for the rim.

ST classes seem to be working the same way. Shorter tire is better. Lower CG, quicker pulls coming out of corners. Lots of fast guys run the 195 toyo, cause it is faster than the 225 toyo in a 15. Lots of debate about why it is faster. So the 195 tire is .4" shorter than than the 225. Gearing ratio or total tire diameter seems to make the most difference. Also keep in mind that even if the wider tire is the same diameter as the smaller tire, once you mount it on a smaller rim, the diameters will not be the same. As the wider tire get squeezed in at the bead, and the rest of the tire has to go somewhere.