Bike It Black 10mm Reverse Thread Mirror Extender

These mirror extenders provide a much improved rear view with the OEM mirrors on the 2025 model year Honda GB350S. The GB350S mirror stems have an M10 left hand thread on both sides. This kit allows you to move the mirrors out 40 mm, and up 30 mm. The OEM adapters between the mirror stem and the switchgear have a left hand thread at the top and a right hand thread at the bottom. Importantly, the extenders easily clear the throttle cables on the right side. To install this kit you will need two 14 mm open ended spanners and an 8 mm Allen key.

These fitted my CB750 Hornet as Honda decided to use left hand (anti clockwise) thread rather than the usual right hand (clockwise) thread. I originally ordered a pair of Oxford right hand thread risers from SBS which had to be returned. I have only awarded 3 stars as the SBS listing is only for 1 riser which is not stated (who only fits 1?) so I had to wait for another one to arrive. Secondly the quality is nowhere near as good as the Oxford risers. When fitted the bolt heads are exposed whereas the Oxford units are better quality and include caps to hide the blots giving a more factory finished look. They are functional and will do the job but you will need to order 2 and they won't provide that factory finished look.

I recently bought a new Honda GB350S, which is a great bike but the mirrors only show me a view of my elbows. I had seen on the Facebook group for the bike that some owners were fitting mirror extenders or going for bar end mirrors. The Honda though has reverse threads on the mirrors, so not all extenders would fit. These are excellent. The positioning of the mirrors now allow a good view behind with just eye movement, rather than having to move my head. The height of the mirrors is also similar to the straight ahead view so a very quick glance is all that is needed.
These mirror extenders are easy to fit and, putting it simply, just work. I can recommend for anyone with a GB350S!