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Old 12-06-2002, 12:13 AM   #1
subiefan
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Default Anyone run Toyo RA-1's on the track?

I have 17" Rota Attacks that I plan to put some R-compounds on in the spring for track use but upon doing a search I've been reading some conflicting things on fitment issues.

Unfortunately the only sizes close to the desired 225/45-17 in the Toyo RA-1's are the 235/45-17 and 235/40-17. The 235/40-17s seem to be the closest rolling diameter but I'm not sure if they will fit on my '02 sedan with Prodrive springs without rubbing.

Anyone run this size with my spring (or similar) set-up? Any problems with fitment? After a season on the track with Falken Azenis I'm ready to step up to some R compounds and I've read enough positive things about the RA-1's that I'm interested in trying them.

Thanks,
Jon
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Old 12-06-2002, 12:29 AM   #2
elgorey
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RA-1 is the spec tire for Spec Miata, American Iron, and several club racing series.
Next year it will also be the spec tire for Speed World Challenge GT.
They are extremely durable, and they last a whole season of hard racing even for the heavy American Iron guys.

Word is, they are only .2 slower per lap than new hoosiers, and dont lose grip after 2 races like hoosiers do. Should maintain a very high grip level for their entire life.
just make sure to get them shaved for dry use, and heat cycle them properly

edit: uh....after reading your post a little closer I realize I didnt answer your question.... sorry
anyway i will leave it for anyone curious about the RA-1

the 235/40 should fit your car without rubbing. the 48 offset rotas push the wheel out and should leave some extra room on the inside. also the 235/40 will give you slightly better gearing so i say go for it.
the 225 azenis are a _very_ wide tire. probably as wide or wider than the 235 ra-1s. so if you ran the azenis you shouldnt have a problem with 235 ra-1s.



Evan
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Old 12-06-2002, 01:50 AM   #3
rkkwan
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There's one problem that you should be aware of -

Toyo approved wheel width for the 235/40R17 is 8 to 9.5in; while 235/45R17 is 7.5 to 9.

I've heard of people mounting 235/40 on narrower wheels, but I don't think that's a good idea for track use.

-Ray
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Old 12-06-2002, 08:16 AM   #4
IXLR8
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One thing to consider, if you're not completely married to your Rota's is to run 225/50/16's on your stock wheels... RA-1's come in that size and are actually slightly cheaper than the 17's... also, there are no fitment issues (either rim width or clearance).

The RA-1's are everything elgorey mentioned and then some... what they give up (and only slightly) in all out speed, they more than make up for in drivability... very forgiving and predictable.
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Old 12-06-2002, 11:05 AM   #5
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I have a lot of track miles on 225/50/16 RA1s. They are an excellent tyre. Wonderful grip and very predictable close to the limit. They work very well in hot and sunny So. Cal. They are to my understanding, just a little harder than most R compounds, so they wear a little better
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Old 12-06-2002, 12:32 PM   #6
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Quote:
Originally posted by HoRo1
I have a lot of track miles on 225/50/16 RA1s. They are an excellent tyre. Wonderful grip and very predictable close to the limit. They work very well in hot and sunny So. Cal. They are to my understanding, just a little harder than most R compounds, so they wear a little better
I know people who fit 225 wide tires on 6" wide rims (Type Rs and Civic Sis). So a 235 rim should fit on a 6.5" rim. Initial turn in would suffer, but you would have more lateral grip. A 235 tire would also fit on a 7" rim, but the recommend size of course is 8".
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Old 12-06-2002, 01:59 PM   #7
subiefan
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Thanks for the replies!

elgorey: Pretty much what you wrote is why I want to try out the RA-1's. Do you think they'll last a whole season even if I shave them? Kind of a noob question but logic tells me that if I don't shave them there will be more tread to wear down, thus leading to a longer life. Oh, I didn't tell you that the Azenis that I ran last year were on the stock rims at 215/45/16 and yes they are pretty wide but probably not as wide as the 235 RA-1's.

rkkwan: Good point, especially on the track. Now I'm kind of at a loss of what to do because the last thing I want is for the bead to pop off on the track

IXLR8: I thought about using the stock rims again but I fried my rotors (2 sets!) on the track at the end of the season and am going to the Stoptechs in the spring so I bought these Rotas for the sole purpose of putting my snow tires on in the winter and track tires in the summer.


Any other suggestions would be appreciated since rkkwan brought up a good point about the recommended wheel width. Now I'm kind of at a loss because I've already bought the Rotas. My second tire choice is the Kumho Victoracer but I'm almost certain that would only last me about a 1/2 a season. Any thoughts on the Michelin Pilot Sport Cup or other track-worthy tread?

Jon
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Old 12-06-2002, 02:26 PM   #8
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One of our competitors at this year's OTC uses the Pilot Cup. They seem to like it. The nice thing about them is that they are assymmetrical but not directional. So you can rotate the tires around and don't need to have them remounted.

-Ray
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Old 12-06-2002, 03:03 PM   #9
elgorey
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Quote:
Originally posted by subiefan
[b] Do you think they'll last a whole season even if I shave them? Kind of a noob question but logic tells me that if I don't shave them there will be more tread to wear down, thus leading to a longer life.
Actually a shaved RA-1 will last longer than unshaved. Not intutive at all, but it has to do with the wear patterns of a full tread soft compound, and also that the extra heat generated by all the tread squirm will burn up the tread quickly.

Have you ever seen a kuhmo Ecsta V700 with "the groove of death" ? not pretty, when full tread often times that tire will completely wear away the center treadblock.


Quote:
. Now I'm kind of at a loss of what to do because the last thing I want is for the bead to pop off on the track
Like CivicSiRacer said, I wouldnt worry about it. Especially with the super stiff sidewall of a r-tire, its not going to pop off. The honda guys have more experience than anyone at cramming wide tires on narrow wheels. I also know that there was a WRX autoXer who put 245s on his stock 6.5" wheels.


Quote:
I thought about using the stock rims again but I fried my rotors (2 sets!)
*sigh* Im right there with you, I went through 3 sets of rotors.........

Quote:
My second tire choice is the Kumho Victoracer but I'm almost certain that would only last me about a 1/2 a season.
depending on how many events and how hard you drive, they [i]could[i/] last a whole season. but no doubt the toyos will last longer. Since the kuhmos are cheaper than the toyos, you could just plan on buying 2 sets of the 16"s for not too much more than 1 set of toyo 17s


Quote:
Any thoughts on the Michelin Pilot Sport Cup or other track-worthy tread?
expensive! more than hoosiers, although supposedly they are more durable and stick just as well.
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