This is the stock unit that came with the bike. For most purposes it is of decent quality and effectiveness, but aftermarket units are much stronger.
Scott Summers Racing makes one. It is of good quality, but I have read a story or two about them snapping during a high speed chain brake. Honestly though – sometimes there is just bad luck involved. These seem to be a quality unit. It should be noted that this unit will not allow you to run a 15 tooth countershaft sprocket without a little trimming.
Kiwi Sports in New Zealand makes this larger unit. At first glance it appears to offer great protection. However, it has been said that it is the poorest choice of all. The Kiwi Sports unit mounts to a smaller
XR’s Only Makes a couple different units. These are widely regarded as the most stout unit because they use a spacer to attach the guard to a larger case bolt rather than the smaller bolt most other units attach to. They make both a 14 tooth version and a 15 tooth version.
The only manufacturer still making a quality frame guard is BB Aluminum. They look like this:
They also manufacture some very high quality skid plates, chain guards, muffler inserts, and speedo eliminator kits.
If you live in the United Kingdom the BB Aluminum products can be purchased through Demon MX - they are the UK importer.
Additionally, guards can be made easily at home by cutting thing aluminum or chrome diamond plate – then affixing it to the frame either through a couple small bolts (drill and tap holes) or with some 3M double sided tape or glue.]]>