SE Bikes
SE Bikes Lockit Chain Tensioner
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Get that chain locked down with the SE chain tensioner.
-Genuine SE Racing chain tensioners
-Improved design and function
-Easily adjusts to take up chain slack
SE Bikes
A legendary BMX brand from the 70's. Now producing all kinds of cool bikes.
Product reviews
Write a Review5 Stars
Works amazing
EZ PZ
they are easy to use and look great.
5 Stars
It was worth it for a se bike or mafia if your chain keeps getting lose and when it petals by itself 
Perfect
Just what I needed
great, but...
... it doesn't actually fit into 10 mm drop outs – the "foot" that pushes on the back of the frame drop out has a shoulder on either side of the adjustment bolt that make it 14 mm wide. this isn't a total dealbreaker for 10 mm dropouts, but it does mean that if you run your axle to the front of your dropouts you may run out of room inside this tensioner because the last 2 to 3 mm are taken up by those shoulders.