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> Tyre Issue?
elan
post Dec 12 2006, 03:45 PM
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Every now and then we are upgrading tyres. The definition of tyre upgrade
always mean 'bigger' tyre. Naturally the reason for upgrade should always
be for better traction with the expectation of 'better' handling. And thus
we can see Iswara with 17", Myvi with 17", or Waja with 18" tyres. The
issue is how can we relate bigger tyre with good handling? Is this really true?
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cucuk
post Dec 12 2006, 04:08 PM
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the problem is, tyres made of better compound are usually low profile
tyres as high profile tyres generate more heat and hence, harder compound
need to be used, when u wanna use low profile tyre, obviously u need to
increase the rim diameter lor (but not necessarily the width)

so, the question now is whether low profile tyre will translate to better
handling?
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vr2turbo
post Dec 13 2006, 10:47 PM
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Hi guys,

It depends on what performance you require?

Yes, Normally higher performance tyres come as larger donuts from 17 to 21
inch.
If you are talking about good cornering performance with less roll, then a
215/40/R17 are perfect. 215 size of contact patch, 40 series giving less
roll in corners, but you ride will suffer.
Another point is the weight of your car. If it is too light, the wider
tyres are of not much use either.
Again, when your wide tyres start to wear say about 50%, your wet grip goes
too (Water channel shallow).
Ofcourse there are also cheap 17" and 18" tyre in the market, therefore do
not always say the Waja with 18" donuts is high perfomance, but more for looks.
So it all depends on what you want.

rdgs,
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Advisor
post Dec 16 2006, 12:51 PM
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elan,

Upgrade should be bigger rims, thinner sidewall and maybe fatter
tyre. Overall diameter should be the same. Reason to upgrade, to
differenciate my red Ferrari with your red Ferrari. Performance, a 185/60
R14 Sushi rubber can stop better than a 205/40 R16 Nasi Lemak/teh tarik
rubber.
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vr2turbo
post Dec 16 2006, 03:40 PM
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Not "maybe fatter tyres"

Once you increase rims size, down your aspect ratio, automatically you will
have to use wider (fatter) tyres, to get back to your overall diameter.

rdgs,
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Advisor
post Dec 16 2006, 05:27 PM
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vr2turbo,

In the past yes but presently, no. Let us look at 15" as an example. The
common sizes are 195/50, 195/55 (Waja), 195/60 (Perdana SEi), 195/65
(Merc. W124). Today, Toyota Vios G tyre size is 185/55 R15 and Proton
Savvy tyre size is 175/50 R15. A friend I know shoed his Kelisa with
165/40 R15. Honestly, I didn't believe him until I saw the tyre. If my
car original tyre size is 175/70 R13 I can change it to 175/65 R14 (Vios
E)or 175/55 R15. Believe me, these sizes are available but scarce.
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vr2turbo
post Dec 18 2006, 11:38 AM
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Advisor,

Tyre size is not changed as you have drop only 5% aspect ratio.

Most conversion drop by 10%, that is why for a 175/70/R13 will be 185/60/R14.
Another issue is, 5% does not affect your tyre spec much, and since still
on same tyre width, traction also no change.

rdgs,
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cucuk
post Dec 18 2006, 05:02 PM
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i think it is the thinner sidewall that improve cornering, not larger
width, so if i wanna upgrade, i wud also wanna stick back to the original
width and OD, the problem is availability of size
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vr2turbo
post Dec 18 2006, 05:40 PM
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Yes, Improved cornering is due to lower aspect ratio (thinner sidewall),
but traction comes from more contact patch, means (wider tyres).

rdgs,
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cucuk
post Dec 19 2006, 10:37 AM
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but wouldnt u think that unless the engine has increased in power, there
is actually no need to increase the traction, furthermore, i think if the
weight acting on the tyre remain constant, increasing the width of the
tyre wud not really increase the contact patch cos how much contact has
on that surface also depend on pressure acting on it
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