Cast or Forged Rims?
10-12-2006 | 02:30 AM
#26
One & only low rider ...
Joined: Mar 2005
Posts: 161
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From: Singapore
Originally Posted by nex100
the question shld not be the size of the rim but the amount of contact your tyre have with the road surface. tyre with larger width (usually comes with bigger rims) need more frictional force to run the same distance hence acceleration and fc performance will be less than the same car running smaller rims.
FC wise is highly dependable on your driving style.
Enjoy your rims hunting experience.
10-12-2006 | 02:59 AM
#27
SC 300HP!!
Joined: Dec 2004
Posts: 3,182
Likes: 0
From: Singapore, North-east
Originally Posted by Low rider
Sorry, I don't know if race cars uses 17" but i know u are .. 
....not mathematically inclined enough to reply your weight x force + accel - torque question.
sorry .........
why are we on lorries wheels ?
End of the day, wheels are quite personal and voice down to the purpose of performance or show car look only. Yes, i do love to have the 22" bling bling wheels
....not mathematically inclined enough to reply your weight x force + accel - torque question.
sorry ......... why are we on lorries wheels ? End of the day, wheels are quite personal and voice down to the purpose of performance or show car look only. Yes, i do love to have the 22" bling bling wheels
10-12-2006 | 07:23 AM
#30
Registered User
Joined: Feb 2005
Posts: 240
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big wheel, small wheel, big rim small rim. it's the balance one needs to strike.
generally, for the same one round made, bigger wheel give you more distance (ie more speed). however it MAY take more effort to turn that one round since material used MAY be heavier to construct that wheel.
going into details and following specs from initial discussion, ie assuming wheel radius (rim radius plus tire height) and tire width are constant, one cannot be sure bigger lighter rims will be better than the smaller heavier rim. since the effort (force) to turn the weight one round depends on rotational inertia (weight * radius^2, where radius is meadsure from centre of wheel to centre of gravity of weight of materials). ie, the more weight is distributed to the edge, more effort is required to turn the wheel. the force required to turn the wheel is heavily punished by the distance away from centre, given the power of 2 effect, compared to a reduction of weight (which may be insignificant due to redistribution of weight to outer edge).
for race cars, why they dont use oversize rims, i beleive it's abt striking a right balance. based on the above discussion, it would appear than small rim is better. but higher tire wall means poorer handling (and energy transfer) since rubber flexes more than metal. so a compromise is made (between rotational inertia and handling), smaller (or not oversized) rims compensated by stiffer rubber tire walls.
generally, for the same one round made, bigger wheel give you more distance (ie more speed). however it MAY take more effort to turn that one round since material used MAY be heavier to construct that wheel.
going into details and following specs from initial discussion, ie assuming wheel radius (rim radius plus tire height) and tire width are constant, one cannot be sure bigger lighter rims will be better than the smaller heavier rim. since the effort (force) to turn the weight one round depends on rotational inertia (weight * radius^2, where radius is meadsure from centre of wheel to centre of gravity of weight of materials). ie, the more weight is distributed to the edge, more effort is required to turn the wheel. the force required to turn the wheel is heavily punished by the distance away from centre, given the power of 2 effect, compared to a reduction of weight (which may be insignificant due to redistribution of weight to outer edge).
for race cars, why they dont use oversize rims, i beleive it's abt striking a right balance. based on the above discussion, it would appear than small rim is better. but higher tire wall means poorer handling (and energy transfer) since rubber flexes more than metal. so a compromise is made (between rotational inertia and handling), smaller (or not oversized) rims compensated by stiffer rubber tire walls.
10-12-2006 | 08:12 AM
#32
Registered User
Joined: Jul 2004
Posts: 458
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From: Singapore
Originally Posted by Low rider
We had tried the following :
1) Same Car (same set-up)
2) Once on 19" (F 245 / R 275) and another on 16" (stock) on a different day
3) Same driver
Conclusion is the tyres play a big part in the test where 19" using conti sc2 for front and michelin ps2 for the rear, 16" on totally "wan chng" RE040.
1) Same Car (same set-up)
2) Once on 19" (F 245 / R 275) and another on 16" (stock) on a different day
3) Same driver
Conclusion is the tyres play a big part in the test where 19" using conti sc2 for front and michelin ps2 for the rear, 16" on totally "wan chng" RE040.
10-12-2006 | 10:08 AM
#33
Registered User
Joined: Feb 2005
Posts: 240
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Originally Posted by sqflyer
Nicely put, sandman... Indeed, it's a matter of balance and what you are modding your car to achieve.
- reputed rims;
- lighter than stock
- and most importantly, BIG rims LOW profile tyres.
10-12-2006 | 02:12 PM
#36
SC 300HP!!
Joined: Dec 2004
Posts: 3,182
Likes: 0
From: Singapore, North-east
Originally Posted by sandman369
ya looking good is VERY important, forgot abt this.
1. ai hiao
2. ai gui
3. ai hao lian
4. ai pi lang swee
5. ai branded
hehehehehe....
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