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Reply to "Finally - Narrowed trailing arms for IRS"

ALB posted:

I don't know why it's not done more often; I guess because it's quite involved. With an irs it is the way to get the most tire under the rear, though, and if you look at the steady progression of wider tires under the rear of 911's through the years there is a benefit. A few different shops have done them over the years but I guess there's just not enough demand to keep shortened irs arms in stock.

my guess is the rear wheel alignment.  i found even the first small tack weld put the geometry out a few degrees.  IIRC, i had to set the rear caster where i wanted it, the grand off another 1-2 degrees (pivot from the first tack weld)... then do the first tack weld.  dont know if that made any sense, but even with cooling (outside) checked, i had to factor warping.  not hard, but LOTS of measuring.

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