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Londonfixiebike ISO Cog | $36
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Londonfixiebike ISO Cog

BikeRadar verdict

4 out of 5 stars

"Niche but nice; could be useful for expedition tourers"

By BikeRadar

This sprocket (cogs mesh with other cogs) bolts to the ISO (six bolt) disc mounts on a mountain bike hub in place of the brake rotor. 

With a 135mm wide frame/wheel, you can then flip the wheel to get a fixed gear; you may need washers to tweak the chainline. With a narrower frame you’ll need a re-spaced front disc hub – which LFB sells. Why not just use a normal fixed rear hub with a lockring? 

The main advantage – apart from the secure fitting – is that in 135mm frames it allows unusual flip-flop combinations. You could have a fixed cog option for your singlespeed mountain bike, for example. Chain tugs help.

The ISO Cog comes in 1/8in and 3/32in in 16-19T.

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Specification

Name:
ISO Cog
Built by:
Londonfixiebike
Price:
$36.00

Manufacturer's Description:
Mounts onto any standard 6 bolt disc-hub to convert your bike into a fixed wheel.
Sprocket Tooth Size:
16, 17, 18
Sprocket Sizing:
3/32 In

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