coyoteboy
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| posted on 14/11/11 at 11:27 AM |
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List of common tyres
While I'm planning my suspension design I'm attempting to find a list of commonly used (and hopefully therefore) cheapest wheel/tyre size
combinations that'll take the sort of torque I'll be putting down. Does anyone know of a list of road-legal tyres by
"common-ness"? While I don't want to choose my tyres by price strictly, I also don't want to choose my price by design which
could be very pricey!
[Edited on 14/11/11 by coyoteboy]
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mark chandler
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| posted on 14/11/11 at 11:43 AM |
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simples 
Just look at 13" wheels with 60 to 70 section tyres, 185 upwards job done.
If its good enough for fomula racing cars then its good enough for these little cars, plenty of room for brakes, I cannot get mine hot on a track,
should not have bothered with vented discs!
IMHO the lower section tyres are not suitable for a car of this weight, you need the side wall compliance for comfort and if you track then get some
£10 - £15 second hand slicks and enjoy a really fast grippy time.
Torque and power, they will suck up 300bhp from a grunty v8, your problem is getting the power down without the wheels spinning whatever size you
use.
Regards Mark
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MakeEverything
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| posted on 14/11/11 at 11:44 AM |
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What sort of torque are you hoping to "Put down" then? Tyres are rated at weight and speed, not torque so there is no straight forward
answer to that.
Kindest Regards,
Richard.
...You can make it foolProof, but youll never make it Idiot Proof!...
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coyoteboy
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| posted on 14/11/11 at 12:13 PM |
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I guess I'm looking to find a list of tyres so I can do some calcs on friction from loads and areas required. I think I'm going to be
traction limited but possibly not as much as a traditional 7 setup - I'll have the V8 hanging over the rear. putting out ~400nm at the crank,
but I don't want to start off speccing a ~300 width tyre and only have the choice of one, but likewise I don't want to spec a 225 and
spend all day unable to get any power down. I know it's not quite that simple but I want to know the field before starting to play, if you catch
my drift.
It's pretty painstaking work checking every tyre size close against cost and availability across retailers etc, I was hoping someone had done
some of the work 
[Edited on 14/11/11 by coyoteboy]
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mark chandler
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| posted on 14/11/11 at 01:08 PM |
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This supplier would seem to cover all bases www.longstonetyres.co.uk
Regards Mark
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coyoteboy
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| posted on 14/11/11 at 02:50 PM |
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Wow, they seem to have a fairly limited list of manufacturers and a rather scary price list. Will certainly be trying to avoid £300 a tyre 300mm ones!
None of those seem to be "normal" tyres - they're all high sidewall road legal semis. Hmmm I'll keep looking.
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scootz
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| posted on 14/11/11 at 04:34 PM |
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Might be an idea to mention...
1. What you're building?
2. What weight?
3. What your weight distribution will be?
4. Wheelbase / Track?
5. Engine Power / Torque?
6. Top speed?
Otherwise we're all just farting in the fog with guesswork!
It's Evolution Baby!
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coyoteboy
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| posted on 14/11/11 at 05:15 PM |
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Not really, I'm not asking you to pick tyres for me - I'm happy to do that selection myself. I just wondered if there's a list of
the most commonly available tyres so I can do my own research and identify my own chosen compromise. I know you're all trying to be helpful in
tyre size selection but I really don't want that
My point being that, for example, certain combinations of profile and width are more common, being sold on large numbers of production cars, and so
are more likely to be cheaper. Then from such a bunch of data I can scoot about and find one with a suitable load index, speed rating etc.
Though, for reference, I'm scratch building and aiming for:
~600kg
V8, mid rear ~300hp ~400Nm
~60/40 R/F dist
track ~ 1800, wheelbase not chosen
top speed theoretically mental (lapsim data suggests with the box and rough sizes/weights I'd see upward of 175 in top including aero drag but
I'm guessing >130 would be unlikely - I've not identified the best way of dealing with that and the IVA yet)
[Edited on 14/11/11 by coyoteboy]
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scootz
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| posted on 14/11/11 at 05:45 PM |
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There are bugger all production cars of the sort you're describing so you're unlikely to find your answer by looking at the
'norm'!
Do yourself a favour and take your lead from the likes of Ultima / Gardiner Douglas, etc. See what they recommend and them whittle it down from
there.
If you're looking to keep costs down, then shave it from somewhere other than the 4 small contact patches that keep you on the road!
Compromising here could lead to BIG problems!
It's Evolution Baby!
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coyoteboy
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| posted on 14/11/11 at 10:24 PM |
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quote:
Do yourself a favour and take your lead from the likes of Ultima / Gardiner Douglas, etc. See what they recommend and them whittle it down from
there.
Indeed, that's one of my starting locations
quote:
If you're looking to keep costs down, then shave it from somewhere other than the 4 small contact patches that keep you on the road!
Compromising here could lead to BIG problems!
Definitely, completely agree. I just don't want to restrict myself to one-off tyres at £500 a piece
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coyoteboy
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| posted on 14/11/11 at 10:44 PM |
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Interestingly while the Ultima uses 335 18's at the rear, the Atom 500 (lighter, but equal power to the ultima, give or take) seems to use
something closer to 255s from images I've seen. Both of which have significantly more power/trq than I will.
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Fred W B
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| posted on 15/11/11 at 05:21 PM |
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Lots of discussion about tyres in the sizes you seem to be considering on
www.gt40s.com
Cheers
Fred W B
You can do it quickly. You can do it cheap. You can do it right. – Pick any two.
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hughpinder
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| posted on 15/11/11 at 05:57 PM |
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I always think the caterhams make a good reference point -an R500 uses 6J13 wheels on the front and 8J13 on the rear, the tyres are Avon CR500,
175/55/13 front @£110 (from caterham) and 205/55/13 at £125 on the rear. 263bhp/505kg car. I'm sure you can better those prices. Caterham also
sell Avon ZZR tyres in similar sizes (10mm wider front and rear) for the same money. You are proposing an awful lot more torque than those cars
though!
Their SP300R is running cooper F3 tyres 245/40/15 rear, 195/45/15 front (305bhp/290nm/450 kg)
Regards
Hugh
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scootz
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| posted on 15/11/11 at 06:05 PM |
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quote:
Originally posted by hughpinder
... the tyres are Avon CR500, 175/55/13 front @£110 (from caterham) and 205/55/13 at £125 on the rear. 263bhp/505kg car. I'm sure you can better
those prices...
'fraid not. Avon only supply CR500's to a handful of distributors and they all charge within a few pence of each other. I really rate
them... about as light as you'll get before you switch to cross-ply ACB10's.
It's Evolution Baby!
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