I have Serfas thunderbolts 2.0 front and back. Easy to mount on aero bars and seat stays. I also have a Bontrager R-flare in back. Motorists many times thank me for being so visible.

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David
* Ironman for Life! (Blog) * IM Everyday Hero Video * Daggett Shuler Law *
Disclaimer: I have personal and professional relationships with many athletes, vendors, and organizations in the triathlon world.