Side thrust - presumably taking power off the wheel, either at the axle by
means of a crank or from a gear ring fixed to the spokes or even around the
rim of the wheel would tend to twist it.
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.308 / Virus Database: 266.8.4 - Release Date: 27/03/2005