AFMS+ is a toptube fastener and scratch protection in just one product. It's compatible to all SLOTBAGs with the AFMS system. The AFMS+ size you need depends on the SLOTBAGs AFMS area that's parallel to the toptube of your bike, e.g. if the AFMS area on your SLOTBAG parallel to the toptube of your bike measures lenghtwise 40cm, you need a 35cm AFMS+ element.
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Correct sizingJust measure the lenght on which the SLOTBAGs AFMS area is attached to the toptube of your bicycle. It's possible to combine two AFMS+ elements, e.g. you have measured 55cm, you can now chose a 45cm AFMS+ element or combine two 25cm AFMS+ elements.