what is Rim Width? and what is the diference beatween 6j and 7J?

Question

This is tehnical details for set Number 1:
Metal Type: Aluminium
Stud Diameter: 108
Rim Width:6J
Rim Diameter:16 inches
Offset: 49
This is tehnical details for set Number 2:
Metal Type: Aluminium
Stud Diameter:108
Rim Width:7J
Rim Diameter:17 inches
Offset: 40.......
I have 16'' alloy wheels on my car, but I want 17''! Can i By set Number 2 for my car???
Somebody Answear PLEASE! ;)

Answer 1

its to do with tyre wall build up to thin or to thick a tyre would come off rim its all safety dont fit wrong size of tyre for wheel

Answer 2

Rim width is the distance across the rim of the wheel, from the outside rim to the inside rim.
The wider the rim width, the wider the tyre you will need.

By going to a wider rim, you may encounter problems with the tyre fouling the bodywork in bump and/or steering lock.

Only the car manufacturer, or someone else who has already investigated the issue, can tell you if your particular car (you don't say what make, model or year it is) can accommodate 7" wide wheels without bodywork modifications and/or modifications to the steering rack to reduce the lock to prevent fouling on the inner wheel arch. A good wheel dealer may be able to help.

Also be careful with changing the offset - this is the distance between the centreline of the wheel (mid-point of the rim width) and the mounting face. If you change the offset you change the position of the loads on the suspension components, which may lead to failure in the future.

Answer 3

Not a complete expert so if anyone knows please correct me............a word of warning!!

If you change the diameter of your wheels on your car........you may be at risk of inadvertantly adjusting your speedo reading. By increasing the diameter you are actually changing the speed ratio..........Smaller wheels mean faster acceleration from standing start.........Larger wheels mean faster overall speed (I think it is that way round). This happened to a friend of mine by changing from 14" to 16" wheels. Got caught in a speed trap and was over the speed limit in force. Changing the wheels had altered the speedo reading by 7 miles per hour.........and no excuse in court.........result....fine and penalty points!

Nice as they sometimes look, changing the sizes may not be worth it unless you are prepared to change the speedo set up as well, then you are getting expensive.

If I am wrong I will gladly accept correction from someone with more knowledge.

I know it may sound like a small amount going from 16 to 17 inch wheels but it may be worth looking into.

Answer 4

I tink dey fit, dey inch vider but less offset so al extra width on outsite , need wide arch but not fowl on inner arch or strut.
Using low profile tyre keep rolling radisu same speedo not alter, if /45X 16 using /40X17 but checking speedometer they kilometer post ant 100 metre post dual carageway on, go 60 mph and see if start count at Kilometer post and then see how long to get 1800 metre, is vere nere mile, better than 1% shud be 60 second, if more than 60 speedo slo try gen, if less speedo fast
Wheels mark Imperial, or metrical. Metrical has bead retentions running flat, Austin uses 315mm on Metro and 365 mm on the Montego, all crap, tyre vere expense vere crap , need tule to change Imperials changing mit screwdrifer, is easy.

Answer 5

the j number is the width and is probably measured in inches and if you get a larger wheel you generally go smaller with the tyre profile therefore making the overall diameter including tyre the same

Answer 6

6J is 6 inch wide. 7J is 7 inch wide. Wheel widths and diameters are never measured in metric.

Answer 7

7j Wheels

Answer 8

One inch.