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Understanding the difference between space saver tyres and OEM tyres. Also know as Temporary tyres or skinny tyres.
We have many questions asked but the main is to explain the difference between the space saver size and the original equipment tyre fitted on your car.
They are many different offering when it comes to spare wheel kit some way to small and some way to big, The K.O.M space saver spare wheel kit is designed to fit as close as possible to your original size tyres, aiming to keep the rolling diameter as close a match to your existing size.
The difference can be up to 3% bigger or smaller, this is totally acceptable and please always remember this is only meant to be a temporary solution to enable you to get to a garage and not be stranded!
Below is a chart to help you understand why we offer the tyre sizes we do:
OEM Tyre Size Difference +/-
175/65R15 K.O. M Space saver option 125/70R17 0.4 - ✔
185/60R15 K.O. M Space saver option 125/70R17 0.8 + ✔
185/50R16 K.O. M Space saver option 125/70R17 2.5 - ✔
185/55R16 K.O. M Space saver option 125/70R17 0.4 + ✔
195/50R16 K.O. M Space saver option 125/70R17 0.8 - ✔
205/45R16 K.O. M Space saver option 125/70R17 2.5 - ✔
205/50R16 K.O. M Space saver option 125/70R17 0.8 + ✔
215/45R16 K.O. M Space saver option 125/70R17 1.3 - ✔
195/45R17 K.O. M Space saver option 125/70R17 0 ✔
205/40R17 K.O. M Space saver option 125/70R17 1.7 - ✔
205/45R17 K.O. M Space saver option 125/70R17 1.7 + ✔
215/40R17 K.O. M Space saver option 125/70R17 0.4 - ✔
215/45R17 K.O. M Space saver option 125/70R17 2.9 + ✔
235/40R17 K.O. M Space saver option 125/70R17 2.1 + ✔
215/35R18 K.O. M Space saver option 125/70R17 0 ✔
225/35R18 K.O. M Space saver option 125/70R17 1.3 + ✔
205/40R18 K.O. M Space saver option 125/70R17 2.5 + ✔
Overall diameter for the 125/70R17 = 23.9” INCHES
Width of the tyre = 4.9” INCHES
OEM Tyre Size Difference +/-
185/65R15 K.O. M Space saver option 125/80R17 1.6 + ✔
195/65R15 K.O. M Space saver option 125/80R17 0.4 + ✔
195/55R16 K.O. M Space saver option 125/80R17 2 .0 - ✔
195/60R16 K.O. M Space saver option 125/80R17 1.2 + ✔
205/55R16 K.O. M Space saver option 125/80R17 0 ✔
215/55R16 K.O. M Space saver option 125/80R17 1.6 + ✔
205/45R17 K.O. M Space saver option 125/80R17 2.4 - ✔
205/50R17 K.O. M Space saver option 125/80R17 0.8 + ✔
215/50R17 K.O. M Space saver option 125/80R17 2.4 + ✔
225/45R17 K.O. M Space saver option 125/80R17 0.4 + ✔
255/40R17 K.O. M Space saver option 125/80R17 0.4 + ✔
215/40R18 K.O. M Space saver option 125/80R17 0.4 - ✔
215/45R18 K.O. M Space saver option 125/80R17 2.8 + ✔
225/40R18 K.O. M Space saver option 125/80R17 0.8 + ✔
225/45R18 K.O. M Space saver option 125/80R17 0.4 + ✔
235/40R18 K.O. M Space saver option 125/80R17 2.0 + ✔
255/35R18 K.O. M Space saver option 125/80R17 0.4 + ✔
265/35R18 K.O. M Space saver option 125/80R17 1.6 + ✔
275/35R18 K.O. M Space saver option 125/80R17 2.8 + ✔
Overall diameter for the 125/80R17 = 24.9” INCHES
Width of the tyre = 4.9” INCHES
OEM Tyre Size Difference +/-
205/70R16 K.O. M Space saver option 165/80R17 0.4 - ✔
215/65R16 K.O. M Space saver option 165/80R17 1.5 - ✔
225/65R16 K.O. M Space saver option 165/80R17 0.4 + ✔
235/65R16 K.O. M Space saver option 165/80R17 2.2 + ✔
225/60R16 K.O. M Space saver option 165/80R17 2.9 - ✔
235/60R16 K.O. M Space saver option 165/80R17 1.1 - ✔
215/60R17 K.O. M Space saver option 165/80R17 0.7 - ✔
225/55R17 K.O. M Space saver option 165/80R17 2.6 - ✔
225/60R17 K.O. M Space saver option 165/80R17 0.7 + ✔
215/65R17 K.O. M Space saver option 165/80R17 2.2 + ✔
235/55R17 K.O. M Space saver option 165/80R17 0.7 - ✔
225/50R18 K.O. M Space saver option 165/80R17 1.8 - ✔
245/45R18 K.O. M Space saver option 165/80R17 2.6 - ✔
215/55R18 K.O. M Space saver option 165/80R17 0.4 - ✔
235/50R18 K.O. M Space saver option 165/80R17 0.4 - ✔
245/50R18 K.O. M Space saver option 165/80R17 0.7 + ✔
225/55R18 K.O. M Space saver option 165/80R17 1.1 + ✔
255/50R18 K.O. M Space saver option 165/80R17 2.2 + ✔
235/45R19 K.O. M Space saver option 165/80R17 0.4 - ✔
265/40R19 K.O. M Space saver option 165/80R17 0.4 - ✔
245/45R19 K.O. M Space saver option 165/80R17 1.1 + ✔
225/45R19 K.O. M Space saver option 165/80R17 1.5 - ✔
Overall diameter for the 165/80R17 = 27.4” INCHES
Width of the tyre = 6.5” INCHES
OEM Tyre Size Difference +/-
205/45R17 K.O. M Space saver option 125/70R18 2.4 - ✔
205/50R17 K.O. M Space saver option 125/70R18 0.8 + ✔
215/50R17 K.O. M Space saver option 125/70R18 2.4 + ✔
215/45R17 K.O. M Space saver option 125/70R18 1.2 - ✔
225/45R17 K.O. M Space saver option 125/70R18 0.4 - ✔
245/40R17 K.O. M Space saver option 125/70R18 0.8 - ✔
255/40R17 K.O. M Space saver option 125/70R18 0.4 + ✔
205/40R18 K.O. M Space saver option 125/70R18 1.6 - ✔
215/40R18 K.O. M Space saver option 125/70R18 0.4 - ✔
225/40R18 K.O. M Space saver option 125/70R18 0.8 + ✔
235/40R18 K.O. M Space saver option 125/70R18 2.0 + ✔
245/35R18 K.O. M Space saver option 125/70R18 0.4 - ✔
255/35R18 K.O. M Space saver option 125/70R18 0.4 + ✔
265/35R18 K.O. M Space saver option 125/70R18 1.6 + ✔
215/35R19 K.O. M Space saver option 125/70R18 0 ✔
225/35R19 K.O. M Space saver option 125/70R18 1.2 + ✔
235/35R19 K.O. M Space saver option 125/70R18 2.4 + ✔
255/30R19 K.O. M Space saver option 125/70R18 0.4 + ✔
265/30R19 K.O. M Space saver option 125/70R18 1.6 + ✔
Overall diameter for the 125/70R18 = 24.9” INCHES
Width of the tyre = 4.9” INCHES
OEM Tyre Size Difference +/-
215/55R17 K.O. M Space saver option 135/80R18 0.8 - ✔
225/55R17 K.O. M Space saver option 135/80R18 0.8 + ✔
235/50R17 K.O. M Space saver option 135/80R18 0.8 - ✔
235/55R17 K.O. M Space saver option 135/80R18 2.6 + ✔
215/50R18 K.O. M Space saver option 135/80R18 0 ✔
225/45R18 K.O. M Space saver option 135/80R18 1.9 - ✔
225/50R18 K.O. M Space saver option 135/80R18 1.5 + ✔
235/45R18 K.O. M Space saver option 135/80R18 0.8 - ✔
245/45R18 K.O. M Space saver option 135/80R18 0.8 + ✔
255/45R18 K.O. M Space saver option 135/80R18 1.9 + ✔
265/40R18 K.O. M Space saver option 135/80R18 0.8 - ✔
275/40R18 K.O. M Space saver option 135/80R18 0.8 + ✔
225/40R19 K.O. M Space saver option 135/80R18 1.5 - ✔
225/45R19 K.O. M Space saver option 135/80R18 1.9 + ✔
235/40R19 K.O. M Space saver option 135/80R18 0.4 - ✔
245/40R19 K.O. M Space saver option 135/80R18 0.8 + ✔
255/40R19 K.O. M Space saver option 135/80R18 1.9 + ✔
255/35R19 K.O. M Space saver option 135/80R18 1.9 - ✔
265/35R19 K.O. M Space saver option 135/80R18 0.8 - ✔
275/35R19 K.O. M Space saver option 135/80R18 0.4 + ✔
285/35R19 K.O. M Space saver option 135/80R18 1.5 + ✔
Overall diameter for the 135/80r18 = 26.5” INCHES
Width of the tyre = 5.3” INCHES
OEM Tyre Size Difference +/-
215/55R17 K.O. M Space saver option 145/80R18 3.0 - ✔
215/60R17 K.O. M Space saver option 145/80R18 0.4 + ✔
225/55R17 K.O. M Space saver option 145/80R18 1.5 - ✔
225/60R17 K.O. M Space saver option 145/80R18 1.8 + ✔
235/55R17 K.O. M Space saver option 145/80R18 0.4 + ✔
215/50R18 K.O. M Space saver option 145/80R18 2.2 - ✔
215/55R18 K.O. M Space saver option 145/80R18 0.7 + ✔
225/55R18 K.O. M Space saver option 145/80R18 2.2 + ✔
225/50R18 K.O. M Space saver option 145/80R18 0.7 - ✔
235/50R18 K.O. M Space saver option 145/80R18 0.7 + ✔
245/50R18 K.O. M Space saver option 145/80R18 1.8 + ✔
245/45R18 K.O. M Space saver option 145/80R18 1.5 - ✔
255/45R18 K.O. M Space saver option 145/80R18 0.4 - ✔
225/45R19 K.O. M Space saver option 145/80R18 0.4 - ✔
235/45R19 K.O. M Space saver option 145/80R18 0.7 + ✔
235/40R19 K.O. M Space saver option 145/80R18 2.6 - ✔
245/45R19 K.O. M Space saver option 145/80R18 2.2 + ✔
245/40R19 K.O. M Space saver option 145/80R18 1.5 - ✔
255/40R19 K.O. M Space saver option 145/80R18 0.4 - ✔
265/40R19 K.O. M Space saver option 145/80R18 0.7 + ✔
275/40R19 K.O. M Space saver option 145/80R18 2.2 + ✔
275/35R19 K.O. M Space saver option 145/80R18 1.8 - ✔
245/35R20 K.O. M Space saver option 145/80R18 1.1 - ✔
245/40R20 K.O. M Space saver option 145/80R18 2.2 + ✔
255/35R20 K.O. M Space saver option 145/80R18 0.4 - ✔
265/35R20 K.O. M Space saver option 145/80R18 0.7 + ✔
275/35R20 K.O. M Space saver option 145/80R18 1.8 + ✔
Overall diameter for the 145/80R18 = 27.1“ INCHES
Width of the tyre = 5.7” INCHES
OEM Tyre Size Difference +/-
225/65R17 K.O. M Space saver option 155/85R18 0.4 + ✔
215/70R17 K.O. M Space saver option 155/85R18 1.8 + ✔
215/65R17 K.O. M Space saver option 155/85R18 1.4 - ✔
235/65R17 K.O. M Space saver option 155/85R18 2.1 + ✔
225/55R18 K.O. M Space saver option 155/85R18 2.5 - ✔
225/60R18 K.O. M Space saver option 155/85R18 0.7 + ✔
235/55R18 K.O. M Space saver option 155/85R18 0.7 - ✔
255/55R18 K.O. M Space saver option 155/85R18 2.1 + ✔
255/50R18 K.O. M Space saver option 155/85R18 1.4 - ✔
235/50R19 K.O. M Space saver option 155/85R18 0.4 - ✔
245/50R19 K.O. M Space saver option 155/85R18 0.7 + ✔
255/50R19 K.O. M Space saver option 155/85R18 2.1 + ✔
245/45R19 K.O. M Space saver option 155/85R18 2.5 - ✔
255/45R19 K.O. M Space saver option 155/85R18 1.4 - ✔
265/45R19 K.O. M Space saver option 155/85R18 0 ✔
275/40R19 K.O. M Space saver option 155/85R18 2.5 - ✔
275/45R19 K.O. M Space saver option 155/85R18 1.1 + ✔
285/40R19 K.O. M Space saver option 155/85R18 1.4 - ✔
195/50R20 K.O. M Space saver option 155/85R18 2.5 - ✔
215/45R20 K.O. M Space saver option 155/85R18 2.8 - ✔
235/45R20 K.O. M Space saver option 155/85R18 0.4 - ✔
245/40R20 K.O. M Space saver option 155/85R18 2.5 - ✔
245/45R20 K.O. M Space saver option 155/85R18 1.1 + ✔
255/40R20 K.O. M Space saver option 155/85R18 1.4 - ✔
265/40R20 K.O. M Space saver option 155/85R18 0.4 - ✔
275/40R20 K.O. M Space saver option 155/85R18 1.1 + ✔
315/35R20 K.O. M Space saver option 155/85R18 1.1 + ✔
Overall diameter for the 155/85R18 = 28.4” INCHES
Width of the tyre = 6.1” INCHES
All the sizes you see above are well within there tolerances I hope this helps with why we offer the conversion sizes we do.
Rely on K.O.M we have over 55 years experience
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