Deda Dog Fang (Chain Keeper) Review

Deda Dog Fang

The Dog Fang is a small plastic accessory known as a ‘chain keeper' which attaches to your bicycle to prevent your chain falling off the inside of your smallest chainring. Many pro mechanics are now fitting them to team bikes.

Deda Dog Fang chain keeper

(In a hurry? Click – Buying a Deda Dog Fang)

The Fang is fitted to the bottom of your seat tube, below your front derailleur. They are available in three sizes and you must make sure that you get the right one for your bike. Measure the diameter of your tube if you don't know it and can't look it up on the manufacturer's website. I measured my seat tube by closing a big adjustable spanner on the tube and then measuring between the jaws. Crafty, huh?

NB This measurement is the outside of the tube – your seat post fits inside the tube so that is not the diameter you want!

If you have a bike with a non-circular tube, or one that is an unconventional size, then you are out of luck. The 3 available sizes are 28.6 mm, 31.8 mm, and 34.9 mm.

I fitted a Dog Fang to my Basso recently after dropping my chain 3 times in one ride. And yes, the bike was set up properly, before some smart Alec tries to point that out! This problem always seems to happen when you least want it to – halfway up a steep climb for instance. Since I fitted the Dog Fang, I haven't fluffed a chainring change. I've looked at the Fang after riding and I can see oily muck on it, so the chain definitely falls onto it from time to time, but it then slides back onto the chainring where you want it.

It's not just a question of lost momentum and lost time when the chain falls off… The chain can get seriously jammed up, damaging it, your paintwork and bike frame. This is something you can avoid by spending just a few pounds/dollars on a Deda Dog Fang (or similar alternative chain keeper) so why not do it!

How to fit a Deda Dog Fang chain keeper (Deda Dog Fang Installation)

The Fang is fitted alongside the chain so that there is only about a 1 mm gap between the end of the Fang and the chain, when the chain is on the smallest chainring and the biggest sprocket (i.e. your lowest climbing gear). When the Dog Fang is set up like this, there isn't a big enough gap for the chain to drop off.

Looked at from the side, the tip of the Fang is alongside the chain.

Here's a photograph of my Dog Fang fitted to my Basso. (Please excuse the state of my bike – I did a long, hard ride yesterday and haven't cleaned the bike yet!)

Deda Dog Fang (Chainkeeper) fitted to bike

My Fang didn't have any instructions supplied with it, but I worked out how to fit it, as described above.

Oh, I've just remembered… When I tried to fit the Dog Fang, it seemed that the bolt supplied was too short. I thought perhaps they'd sent me the wrong size Fang. It turned out the captive nut was not fully inserted into the side of the Fang so the bolt couldn't reach far enough into it to engage the thread. I cured the problem by doing up the bolt as tight as it would go with the Fang taken off the bike. I saw that the nut was pulled further into the hole it sits in. After that, I had no problem bolting it to the bike.

I did a very tough hilly ride yesterday and it was such a luxury not having to concern myself about dropping the chain. I could power my way into the steep climbs in a big gear and get some way up them before having to change down, but confident that I could get my lower gear without grinding to a halt because my chain had fallen off.

The device doesn't cost much, it doesn't weigh much, it isn't particularly noticeable on your bike unless you look for it so it doesn't spoil the bike's appearance and it does exactly what it is supposed to do – 100% recommended!

I was so impressed with the Dog Fang on my Basso that I bought two more – one for my Cannondale and another for my Rock Lobster MTB.

To buy your Deda Dog Fang…

(Many thanks to all of you who have bought Deda Dog Fangs via the link below!)


PS I have been checking my website logs and I can see that some people are clicking the link but not actually buying Dog Fangs. I can only think that you consider them to be too expensive? All I can say is that I bought 3 of them and consider that money well-spent. You'd only have to write off one trapped chain and that could be more than the cost of 3 Dog Fangs to replace, not to mention the potential of catastrophic damage to your bike frame!

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