The rear tyre is fixed between a motorcycle style swinging arm - the adjustable settings need to be bang on - otherwise the belt drive will either be too close to the tyre or trying to sling off the drive cog. frown Mine is sckewed (technical term that!)1/8th" out - not much but enough to create a significant drive belt issue. frown2 The wheel nut is massive which u ned to loosen to adjust - truck size spanner needed which I do not have - so this will have to be corrected at its next service somestick

Neil