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Old 05-27-14 | 10:24 PM
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daihard
Just a person on bike
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Joined: Aug 2013
Posts: 2,140
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From: Seattle, WA

Bikes: 2015 Trek 1.1, 2021 Specialized Roubaix, 2022 Tern HSD S+

I use the Serfas Thunderbolt USB Taillight.

Pros: It's very bright, has four modes (hi, low, hi-flash, low-flash) and is USB-rechargeable.
Cons: It needs recharging every 2-3 days. A full charge takes 2-3 hours.

I mount it on the seat post.
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