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Understeer is partly due to staggered tire sizes, but most of it is to do with the inadequacy of the MacPherson strut front suspension. The big problem is there is not enough negative camber on the front. The static front camber is close to zero. Other cars may gain negative camber as they roll in cornering, but there isn't much of this characteristic on the 135i front suspension. BMW have done a respectable job with the multi-link rear suspension on the 1 series, but it would have been really nice if they had a good double wishbone setup on the front to compliment it.
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