whitestu
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| posted on 15/1/12 at 02:53 PM |
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1st drive with 13" wheels and R888s
Went out for the first time yesterday following a switch from heavy 15" TSW alloys with Yoko A539s to Team Dynamics pro race 1.2 13"
wheels and Toyo R888s.
Not much grip to start with as the tyres were new, but after a few miles they were good, though I wasn't pushing it.
The biggest difference at normal road speeds is how much better the car deals with bumpy B roads given the reduction in unsprung weight, and
surprisingly it self centres much better as well.
Looking forward to getting it on a track now!
Stu
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eddie99
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| posted on 15/1/12 at 02:58 PM |
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Sounds good, I'm on track next week testing actual track time differences between 15 r888 and 13 a048 
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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daniel mason
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| posted on 15/1/12 at 03:03 PM |
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let us know eddie. i have 205/60/13 a048's on my new mnr. 195/50/15 on my last one
does the larger sidewall of the 13" tyre make a big difference?
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coozer
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| posted on 15/1/12 at 03:03 PM |
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Whats the ride like? Any better feed back?
1972 V8 Jago
1980 Z750
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afj
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| posted on 15/1/12 at 03:22 PM |
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Pictures please
eerrrrrrrrrrrrrrrr
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Proby
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| posted on 15/1/12 at 03:41 PM |
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This is something Ive been considering. I've got 15" rims on the F27, but used to run 13" with A021R on my Westfield. Tyes are
cheaper too on 13's which is a bonus!
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dlatch
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| posted on 15/1/12 at 04:21 PM |
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i have actually gone the other way 
my reason being was there is actually a far better range of road tyres for the 15" size (what cars these days use a 13" wheel? ) and as
mine will do just the odd trackday also having light 15" wheels offsets the difference and i could still keep my old 13" for track work
anyway so best of both worlds i guess.
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whitestu
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| posted on 15/1/12 at 04:40 PM |
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quote:
Whats the ride like? Any better feed back?
Ride is definately better, and a bit more feedback but not a massive change in that respect.
Stu
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fullpint
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| posted on 15/1/12 at 05:57 PM |
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Stu; What size are the 13's? as in rim width.. I'm also on 15's running 195/50 but would like to down size. I sell a couple of sets
in the For Sale section that are 13" x 6", I think mine are 15 x 7 ..
And as said 13" rubber is cheaper. Ok my car is mainly road use but having good rubber is a must..
Sounds like the R888 work for you 
I've over 28 years in dealing with magnesium wheels. Refurbishment and can powder coat most metal parts. Visit my web site if you wish..
www.tpcs-magnesium-refurbs.co.uk
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whitestu
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| posted on 16/1/12 at 03:54 PM |
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quote:
Stu; What size are the 13's? as in rim width..
They are 7" wide. I have 185s on the front and 205s on the back, but they should fit on 6" rims.
Stu
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RK
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| posted on 18/1/12 at 12:54 AM |
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I too am going to 15 after having 13's. I never got the pressures right I don't think, so handling left a lot to be desired. However, I
need the clearance offered by the 15's and the tyres were actually cheaper, as they were ex-Miata/MX5 spec tyres in the States, and they
switched to RA1's or something. Brand spanking new R888's. Can't wait!
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martynrich67
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| posted on 27/1/12 at 05:28 PM |
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Did you have any problems with clearance over brakes and/or suspension/hub components, etc?
What wheels have you used?
I'd like to go from 15" Pro Race 1.2s to 13" Revolutions, but by all I have read, it looks like I might struggle.
[Edited on 27/1/12 by martynrich67]
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rdodger
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| posted on 27/1/12 at 06:56 PM |
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I have Pro race 1.2 13" wheels over midilite calipers and 260mm discs. There isn't a lot of clearance but there is clearance.
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RK
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| posted on 27/1/12 at 10:57 PM |
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My 13's are over Mk 1 MX5 brakes. Barely fit, but do not rub.
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fullpint
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| posted on 28/1/12 at 05:11 PM |
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I REALLY must get a set of 13's with decent rubber on.. My current 15's with rain master tyres are totally SH1T.. Perhaps I can borrow a
set for an hour to see the feel the effect!!
I've over 28 years in dealing with magnesium wheels. Refurbishment and can powder coat most metal parts. Visit my web site if you wish..
www.tpcs-magnesium-refurbs.co.uk
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INDY-R ZZR
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| posted on 28/1/12 at 05:21 PM |
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The pro race 13" wheels look very nice too
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Not Anumber
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| posted on 24/4/12 at 06:18 PM |
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i'm going to bracket a spare on the back of the car, in a cover so it doesn't have to look anything like the wheels on the car. Will a
standard 13" Sierra wheel be any use as a spare on an Indy, will it fit over the uprights ?
The road wheels are 15" - not sure if the builder actually needed this size to get over the uprights or just cos they looked nice.
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RK
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| posted on 24/4/12 at 09:51 PM |
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Make sure you have enough ground clearance with 13's. I have a destroyed engine and immobile car for quite a long time ahead of me because of
hitting the road with my sump.
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Not Anumber
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| posted on 25/4/12 at 06:40 AM |
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With a high profile bog standard 13" tyre i'm confident the ground clearance wouln't be much different and we are only talking about
in the event of a puncture. I'm more concerned about whether the inside of the rm has enough clearance against the upright ?
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RickRick
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| posted on 25/4/12 at 08:20 AM |
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I'm in the same boat, about to change rear brake calipers, and thinking of fitting pro race 13" when these tires are done, would someone
be able to measure the inner diameter of the 13" pro race wheels in about the position the disk sits in
Thanks
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loggyboy
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| posted on 25/4/12 at 08:25 AM |
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Is the MK sierra based, IIRC it is. My sierra donor has 13inch steels, so I would guess they should fit fine, providing you havent uprated the brakes
over standard sierra dia.
quote:
The biggest difference at normal road speeds is how much better the car deals with bumpy B roads given the reduction in unsprung weight, and
surprisingly it self centres much better as well.
Also just to add to this, the better dealing with bumps will be largely down to the increase rubber height rather than unsprungwight.
Mistral Motorsport
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whitestu
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| posted on 25/4/12 at 08:44 AM |
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quote:
Also just to add to this, the better dealing with bumps will be largely down to the increase rubber height rather than unsprungwight
That makes sense. I put the 13" wheels against the 15" before I fitted them and the 185/60 13s on the front had the same diameter as old
195/50 15s, and the 205/60 13s on the back were actually a bit bigger.
Stu
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