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@gbj_tester
For the people who still think it's a good idea, imagine if you will the torsion being applied to the frame in the image below. Now consider what would happen to the main beam of that Cherubim if you applied the same load. How much do you think the front of the bike would rotate relative to the back, assuming a 30mm diameter round steel tube of modest wall thickness? Calculation for a hollow torsion bar can be found at http://www.roymech.co.uk/Useful_Tables/Springs/Springs_Torsion.html
In round figures, every 1° of rotation equates to a tracking error (i.e. the back wheel not following the front) of 10mm
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