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Old 05-22-2006, 09:01 PM   #1
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Default what is the correct way to measure track width?

What is the correct way to measure track width for on road car? I just got a Hudy ultimate set up. It comes with a book. It says that the width is measured from the widest part of the front or rear.

I used to measure my 200 mm right under the wheel axle. However based on Hudy book. I am too wide because I m runnint 2 degree toe in in the rear. If right under the axle is 200, then the widest part of my rear is about 202mm.

Can anyone clarify this once and for all? Thanks.
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Old 05-22-2006, 09:18 PM   #2
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Put wheels on the car and use a caliper to measure the width. Remeber different wheels have different offsets, so if you change wheels remeasure the width.
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Old 05-22-2006, 10:02 PM   #3
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Measure from where? from the wheel nut to wheel nut? or the widest part btwn the tires?
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Old 05-22-2006, 10:17 PM   #4
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Dunno about anyone else's interpretation of the rules, but if I was scrutineering I'd be measuring the track at it's widest. That is; if the rears were toed in as well as cambered, i'd be measuring at half the axle height and at the rear of the wheels, the widest of the overall track.

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Old 05-22-2006, 10:29 PM   #5
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Quote:
Originally Posted by straightaway
Measure from where? from the wheel nut to wheel nut? or the widest part btwn the tires?
make sure that the measurement is the same left to right from the centre line of the chassis
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Old 05-22-2006, 10:55 PM   #6
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You measure from the widest point. The car should be able to roll freely through a box that is 200mm wide. The only part of the car that can stop the car rolling is the exhaust stinger. I have seen RRR drivers cut the end of the axle off to get to legal width. That seems pedantic as the axle length wont affect performance, but the guys I have seen do it were threatened with failing scrutineering for being too wide. This has happened at a few of the big meetings in Australia last year. I measure by laying a ruler on the set up board & sitting the car on top of it, at the rear of the tires on the back end (to allow for toe in) & the front on the front end (to allow for toe out) Hope that makes sence
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Old 05-22-2006, 11:11 PM   #7
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Quote:
Originally Posted by straightaway
What is the correct way to measure track width for on road car? I just got a Hudy ultimate set up. It comes with a book. It says that the width is measured from the widest part of the front or rear.

I used to measure my 200 mm right under the wheel axle. However based on Hudy book. I am too wide because I m runnint 2 degree toe in in the rear. If right under the axle is 200, then the widest part of my rear is about 202mm.

Can anyone clarify this once and for all? Thanks.
Im confused about the above too.

So if you set up you car on the hudy tweak/width device to 200mm
and then you adjust your toe , car runs more than 200mm wide.

Thats means using the hudy width gauage is useless
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Old 05-22-2006, 11:18 PM   #8
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Quote:
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Thats means using the hudy width gauage is useless
In a word, yes.
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Old 05-22-2006, 11:25 PM   #9
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what I mean is if there is rear toe in, then if the car is 200 mm measured from under the wheel nut, then the front of the rear tire is about 197 and the rear of the rear tire is about 202. so am I still 200?

The hudy book says the for the rear toe in, if you turn in the rear front pivit ball, you have to turn out the rear rear pivit ball the same amount. This would suggest that you set the 200 mm to right under the wheel nut, so if you toe in then the distance still 200mm. This would means that the widest part of your rear axle is 202.

I asked robbie collins, he says that he set the rear toe zero and 200 then turn in only the rear front to get 2-3 toe in. This way, the widest part of rear is 200mm.

so which is right?
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Old 05-23-2006, 12:13 AM   #10
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Everybody has a different way to do it. But if you look at what you are saying and what everyone else is saying you will get the answer to your question. You measure it at the WIDEST part of the car, so if the rear of the rear tyre is 202mm than that is the widest part of the car so that is your track, hence you will fail because it is over 200mm. Same with the front is you measue the front of the front tyre and it is 201mm it is too wide.

Hope this clears it up for you

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Old 05-23-2006, 12:21 AM   #11
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so even the most rear of my rear tire does not touch the ground, at 202mm I am still too wide?
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Old 05-23-2006, 12:31 AM   #12
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The way I've seen cars get tech is by having a box 200mm wide and rolling it through.
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Old 05-23-2006, 02:00 AM   #13
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Quote:
Originally Posted by straightaway
so even the most rear of my rear tire does not touch the ground, at 202mm I am still too wide?
Yes that is correct. The car goes into a box that is 200mm inside to inside. It is the widest part of the chasis that is measured including all parts of the tyre/wheel.
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Old 05-23-2006, 02:40 AM   #14
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i just put the car on a ruller and put the left wheel on the 0mm mark and just read out the left wheel....
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Old 05-23-2006, 05:11 AM   #15
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Quote:
Originally Posted by straightaway
so even the most rear of my rear tire does not touch the ground, at 202mm I am still too wide?
Yes.

You are to wide if your wheel nuts are more than 200mm apart. It doesnt matter if it touches the ground or not.
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