Can I mount a Flex Mount (SL500) light on an oversize handlebar (31,8 mm)? Mille Stech Jensen August 28, 2017 06:57 Updated Our instructions state that the lights fit handlebars of 10-30 mm, but with a bit of handyman tweaking, it is possible. Related articles How much light does GO emit? Is it possible to connect two Flex Mount (RL700) front lights to one Flex Mount (RL700) generator? SL500 Series Comments 0 comments Article is closed for comments.