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View Full Version : How do Wheel Offsets affect a car?


S2k Racer
2009.06.18, 05:40 PM
Just wondering.

Thanks,
S2kR

S2k Racer
2009.06.24, 02:25 AM
Help please.

color01
2009.06.24, 03:23 AM
In general:

Wider = more high speed steering, more stable
Narrower = more low speed agility

You need to balance the two to perform at the top tier on any given track layout; since these cars go so fast relative to their size, if you can't turn in fast enough you'll miss the racing line, so wider is not necessarily better unlike for most 1/1 size cars. Narrower cars can also slip past other cars more easily, if you have the technical skill to do so. Otherwise, in general wider makes the car faster.

EMU
2009.06.24, 04:10 AM
One thing to take in mind, more than wheel offset is front track width. As you increase the offset of the wheel, you increase the scrub, or the radius of the rotation as the wheel turns. This will have more of an immediate effect on the cars handling into and out of the corner than the track width.

An MR02 with 0mm offset front wheels has the same track width as an Mr015 or AWD with 2.5mm offset front wheels. However, the MR02 will have more steering response into and out of the corner. As you turn the wheel, the wheel is closer to the point of rotation, so you get a faster and smoother reaction as the suspension loads. With a wider offset, the suspension and point of rotation is further from the wheel, which leads to more leverage on the suspension. Promoting binding and requiring you to use a stiffer spring to have the same force on the wheel as the suspension is loaded.

I prefer -1mm and 0mm front wheels. I rarely use 1mm. Reflex came out with the Wide Track Front for the MR02, which essentially is the same as using 2mm wheels on the MR02 front end. This removes the scrub, but still offers the stability of the wider offset. I followed the same notion with my MR015 tower bars, which convert the front end to MR02 width. To make it more competetive by using MR02 bodies without having to use wide offsets. I wish I had a tower bar produced with the same width as the WTF, but that would severly limit the market for the tower bars.

In general, I like bodies that support 1mm or 2mm front offset, and use 0mm wheels with them. I always like to have 1mm more offset in the rear than the front. On the MR02, a 0mm Narrow front wheel is the same width as a 0mm Wide rear wheel. This helps the car have good stability and cornering.

On a small track, a smaller car will tend to do better. On a large track, a larger car tends to do better... With a slower motor, the smaller cars get an edge. With a fast motor, the larger car will have the edge.

I personally prefer driving small cars... But for hardcore racing, I use what feels best and puts down good laptimes. If the car is a handful to drive, like the smaller cars typically are, then there will be less consistancy, and consistancy is what wins races.

S2k Racer
2009.06.24, 01:16 PM
I was thinking of getting a set of +3W rears and +1N fronts since I cant use the ones that came with the FXX on an AWD.

EMU
2009.06.24, 02:49 PM
On an AWD, is the only exception to using wide offset front wheels. You will want to use at least 2.5N front wheels with the FXX. (track is 5mm shorter with 0N compared to MR02).

B-main
2009.06.24, 03:05 PM
what is the offset of the wheels that come with the pn pan body .and anyone know the offset of the stock LM wheels

EMU
2009.06.24, 03:08 PM
Pan
3N/3W

On an MR02 with LM diff,
Porshe 962
2.5N/0.8W
Mazda 787
2N/0W

Traveler
2009.06.24, 06:15 PM
Great info here. Thanks! I'm subscribed! :)

B-main
2009.06.24, 07:50 PM
Pan
3N/3W

On an MR02 with LM diff,
Porshe 962
2.5N/0.8W
Mazda 787
2N/0W

on the pn is that -3 and +3 .are Delrin wheels measurements the same .

Traveler
2009.06.24, 08:42 PM
I think its +3N and +3W

herman
2009.06.25, 12:06 AM
cool info.. once again, thanks for the explanation emu

S2k Racer
2009.06.25, 02:52 AM
On an AWD, is the only exception to using wide offset front wheels. You will want to use at least 2.5N front wheels with the FXX. (track is 5mm shorter with 0N compared to MR02).

huh? you're saying 1N on the MR02 is like 2.5N on the MA?

color01
2009.06.25, 03:52 AM
0N on MR02 is 70mm width, as is 2.5N on an AWD.
1N on MR02 would correspond to 3.5N on an AWD.

Lots of people use 3.5N in the front of an AWD simply because it's necessary to prevent traction rolling, and because the steering axis is nearly inline with the wheel axle on the AWD, steering response is not terribly diminished vs. the MR02.