New R888R sizes for 16x7 17x8? - LotusTalk - The Lotus Cars Community

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post #1 of 9 (permalink) Old 04-19-2017, 02:22 AM Thread Starter
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New R888R sizes for 16x7 17x8?

What tires is everyone running for track? It seems like a popular wheel size anyway because of the wheels like Monolites and Ethos come in these sizes...

I've been running 195/50R16 and 225/45R17 on euro-spec Exige wheels(the heavy cast ones) so far, and I finally got Toybox48 Hethel forged wheels in 16x7(+22) and 17x8(+35).
I've done some googling around, but some of the results are muddied with choices based on aesthetics.. which I don't really care for.... It won't be for autocross either, so no crazy rule-skirting sizes....
I'm running Nitrons with 450/600 springs lowered to 120/130mm f/r, and going lower is not an option as I won't clear my driveway. I already scrape pretty badly going in/out.
My car sees 80% track, maybe occasional canyon runs, and sees 0 rain.

Shamelessly hotlinking from another thread... (New Toyo R888R reviews)

I've seen people run stock 195/225 sizes with their 7"/8" setup with the old R888, which struck me a little odd since the tirerack's Measured Rim Width seem to call for 205/235...
But, now that the new R888R's tread widths are quite a bit narrower than the old one, I'm wondering if I should indeed move up to 205/235. The popular 245 rears are unavailable for the R888R, and I imagine 255 will definitely rub.

If I were to do 205/235, the ride height changes due to different sidewall sizes are....
205/45/16 -0.4"~-10.16mm 235/40/17 -0.3"~-7.62mm
205/50/16 +0.4"~+10.16mm 235/45/17 +0.4"~+10.16mm
If I go DOWN an aspect ratio, I'll have to raise the car ~10mm and re-align/corner balance it. The gearing will be shorter for better acceleration. The tire spring rate probably goes up = quicker response but more skipping on rough patches. Higher chance of wheel damage due to less sidewalls.
If I go UP an aspect ratio, I probably can get away not re-align/corner balancing. The gearing will be longer for poorer acceleration, in addition to additional rotational mass due to more tire. Lower spring rate = lazy handling but possibly more grip. Lower chance of wheel damage, but higher chance of putting holes thru my wheel liner.

To add to my dilemma, I keep finding articles that wider tires don't always mean it's better.
Quote:
Originally Posted by National Auto Sport Association
using a tire with a smaller cross section width is often better than trying to use the widest tire that will fit in the fender well on a rim that is narrower than optimum.
https://nasaspeed.news/tech/wheels-t...-spring-rates/
Quote:
Originally Posted by MotoIQ
rule of thumb:

“For ideal handling: when sizing a tire for a given wheel, I usually target a tire’s TREAD width to be as wide as the WHEEL width, or 0.5” narrower than the wheel width.”
How to PROPERLY select and size TIRES for PERFORMANCE > MotoIQ - Automotive Tech, Project Cars, Performance & Motorsports

I realize the R888R only just came out recently so there isn't much of a data, but I imagine people will start migrating to it once they wear out the old R888s. I expect people to be in similar situation as I am, so I figured I'd leave this out here so everyone can discuss their thoughts and their plans for it.
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Last edited by forkmeupscotty; 04-19-2017 at 01:22 PM.
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post #2 of 9 (permalink) Old 04-19-2017, 05:12 AM
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Toyo R888's (looking forward to the new R888r's)

225/45-16 fronts
255/40-17 rears

Tracked regularly, never had a problem.
Sticks like glue to the track.

Stay Tuned.....
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post #3 of 9 (permalink) Old 04-19-2017, 06:30 AM
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As far as we know, r888r has same compound but a revised tread block to maximize dry traction. So if you want a dual purpose tire the r888r seems to be a worse choice.

"Give a man a match, and he'll be warm for a minute, but set him on fire, and he'll be warm for the rest of his life."
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post #4 of 9 (permalink) Old 04-19-2017, 10:53 AM
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I have been running 205/45/16 and 225/45/17 in the Bridgestone RE71R on my LSS wheels and will keep them for street and driving to tracks 2+ hours away. I have liked them but they are the only tire that I have experience with. I will be getting 16x7 and 17x8 wheels (hopefully) early May and was going to try the same size tires in R888R on them, to use mainly for driving to/from/on the two tracks near me. I am tempted to go with the 235/40/17 rear for more rubber and reduced diameter (being NA, I want all the help that I can get with acceleration).

I have not done any auto-X but may try it sometime.
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post #5 of 9 (permalink) Old 04-19-2017, 11:28 AM
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I have the same size tires coming and was wondering the same thing.

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post #6 of 9 (permalink) Old 04-19-2017, 01:07 PM Thread Starter
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Quote:
Originally Posted by jds62f View Post
As far as we know, r888r has same compound but a revised tread block to maximize dry traction. So if you want a dual purpose tire the r888r seems to be a worse choice.
My car is 80% track and sees 0 rain. Edited the original post for clarity.

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Last edited by forkmeupscotty; 04-19-2017 at 01:22 PM.
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post #7 of 9 (permalink) Old 04-19-2017, 05:25 PM
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@forkmeupscotty

I am in the same situation as you. I plan to move to R888R with:
205/45ZR16
235/40ZR17

The 40 size rears are actually listed at 1 lb lighter on their site plus they have 0.2" more tread width than the 45 size rears. The change in sidewall height most likely will have no impact, you are more likely to notice the additional grip than any reduced rim damage. That's my thought anyway. Plus it puts the height of the rear tire closer to the original tire height of the Yokohama.

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post #8 of 9 (permalink) Old 04-19-2017, 05:26 PM
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I'm going to try the 205/45 & 235/40 on my current Elise which is NA. This appears to be the best performance choice for me but you would likely need to reset ride height/corner balance to clear your driveway.
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post #9 of 9 (permalink) Old 04-20-2017, 05:34 AM
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^that's what I would have got if I had 7"/8" wheels, but I have 6.5/7.5 LSS wheels so I went with OEM 195/225 sizes. I'm glad I didn't go wider with my wheels as the sidewalls are already a bit rounded, wider would have been too bulgy without wider wheels.

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