If fitting mudguards to a bike you're buying from us (or for fitting within the free service period) we'll reduce the charge to $30.
When fitting guards to a bike with a vertical thread under the seat stay bridge (such as 2012 Giant TrailGlides):
Fit guard without stay so set height from tyre (don't assume guard can be bolted straight to frame as it will probably cause conflict with V-brake).
Work out spacer to fit between guard and frame (10 to 12mm on 2012 TrailGlide). Remove wheel, drill guard, put screw through.