Standard Wheel Sizes PCD Offset Spacers Centre bore


Standard Wheel Sizes

The stock wheel is a 14" diameter by 6" width (6J14). Standard tyres are 195/60/14.

The stock wheel is a 15" diameter by 7" width (7J15). Standard tyres are 205/60/15.

The stock wheel is a 16" diameter by 7.5" width (7.5J16). Standard tyres are 215/50/16.


What is the wheel bolt pattern for my GT-Four?
The Celica carries a 5 bolt wheel pattern. The PCD is 5/100 for ST165, ST185, and ST205.



What is the offset required when ordering aftermarket wheels?
The offset is wheel and model specific. It is always worth checking that the wheels will fit, especially on the ST205 which has large brake callipers which may suffer with spoke interference on high offset wheels In general an offset of 35mm should work for most wheel styles.

What is 'Offset'
The Offset of a wheel measures the distance between the wheel centreline and the wheel mounting face and is measured in millimetres. It is extremely important that wheels of the correct offset are used in order to maintain the correct track of the vehicles. Offset can be Positive or Negative and is best illustrated in the two diagrams on the left.

What is Centre bore?
Motor vehicle manufacturers use a central location collar on the stub axle hub in order to accurately locate the wheel. The wheel collar diameter varies, depending on the make of vehicle. The GT-Four uses a 54.1mm collar.

Most replacement allow wheel manufacturers use an adapter (spigot ring) to vary the diameter of the locating hole. The wheel itself has a large diameter hole which is "sleeved" down to the appropriate size with the spigot ring

In this way, a particular wheel can be used on a variety of vehicles by changing the spigot ring

The adapter/spigot ring arrangement is shown below

Should I use spacers with my wheels?
It is a personal choice. Many feel that the 185 (particularly the wide body editions) look better with the wheels pushed out towards the bodywork. It is not uncommon to see 25mm spacers used in this case

The 205 generally will not require such extremes but again depending on wheel choice and offset some spacers may be required One thing to note on the ST205. With the standard wheel (ET45) brake calliper clearance on the backside of the wheel is a serious issue. There is perhaps 2mm of clearance. The wheels also look well pushed in to the centre of the car.

An offset of 30 on a 7.5" rim will put the wheel almost exactly flush with the top of the wheel arch

This is one of the factors governing minimum offset on the ST205 setup

The use of spacers will put additional strain on wheel bearings. While modern bearings are much better at dealing with this than the older versions you should still be aware that you are potentially reducing their life span