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Originally Posted by NASSTY
what would be the effect if you used the same diameter bar front and rear?
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(I really have no idea, but here is my take.
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Too much turn-in oversteer. So that's why you run a heavier bar on the front, lighter bar on the rear. You can dial the turn-in oversteer out to some degree by winding the front shocks up stiffer, but this causes other problems e.g. braking problems on bumpy tracks.
Unfortunately different Cobra makes vary so much in design & suspension setup, so we have no magic formula for all Cobras.
CR guys are working towards a better solution and there is a fair bit of knowledge around for suspension tuning Harrisons as well.
Put it this way, I am surprised by how light a front bar the CR's run. On a Harrison you would be thinking something like minimum 28mm front, matched with 16mm rear. Use adjustable bars. But there are so many variables.