The rear is 40 because this is the profile ratio. The ratio is a proportion of the width. So, to make both front and rear almost the same you have 45% of 225 (101.25) on the front and 40% of 245 (98) on the back. The rears are only 3.25 mm smaller as regards the side wall than the fronts.
GAD was founded in 2009 where we developed bespoke ECU Remapping software for motorsport clients, moving forward, we have extended to road vehicles for both performance and economy, contact GAD Tuninghttp://www.GADTuning.co.ukto discuss your requirements.
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