It’s always best to get the tyre you are considering first, and check that it will fit under the car correctly. Another good tip, many people want different sized tyres on the front to the rear. Make sure you can get the same tread pattern for both front and rear sizes before you start.

The place to begin is where the correct fit is most noticeable, that is the outside of the tyre. Your first goal is to determine the front spacing you need to achieve the correct tyre to guard clearance. Be aware that your wheel width is limited only by the degree of inner body clearance. Budnik can build your wheels with any back space between the established minimum and maximum, in 1/8 “ increments.

To determine your wheel fitment, follow this procedure:

Support your vehicle under the axles/suspension with proper jack stands (not under the chassis). Hang a weighted string from the guard at the point where you want the tyre sidewall to be. Please note that on lowered vehicles be sure to consider suspension travel to avoid the tyre rubbing on the guard when the suspension becomes compressed, for example, going over a dip in the road. Next, measure in from the tight string to the mounting surface of your cars hubs. From this measurement subtract the side wall bulge of the tyre you will be using (difference between tread width and section width) and the results will equal your front spacing. By subtracting the front spacing from your overall rim width you get your backspacing measurement. Note “overall rim width” is one inch wider than “rim width” because of the tyre beads. For example, a 19 x 7” wheel is approximately 8” wide overall.

When determining the inner clearance on the front, check such things as tie rod ends, brake calliper clearance and of course full suspension travel. At the rear the largest concern on fat tyred vehicles is to allow room for body roll and tyre wall flex. As a rule , the taller the tyre ( 70 series up to pro street ) the more side wall flex will occur. Remember that excessive body roll on cornering will reduce inner clearance, usually 1” to 1 ½ “ clearance is enough. Low profile tyres, stiffer suspension and anti roll sway bars will allow you a little extra width.

With careful planning and measurement, together with support from a professional wheel supplier, you will ensure your wheels and tyres not only look the goods, but also do not foul guards or restrict turning circle.

If you’re building a ground up project Budnik have the wheels for you, with our offset options you can build your car around your wheel of choice. For further information contact us here.