i have a 2004x and let my brother have a ride .as he rode away from me i notice the rear light is not very bright .would like to change it for a led one . Anyone have any in mind what i could use ?

I found the OE rear light to work fine. Did you check at night or daylight? Try opening the casing & giving it a clean, maybe there's a thin (or thick) layer of dirt on it preventing the light to shine through.

If you really want an LED then you'll have to chop the rear off. I currently have a DRC Edge 2 fitted on mine, works fine.

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