| The Deda Dog Fang is a small plastic accessory | | | | huh? NB This measurement is the outside of the tube - |
| known as a 'chain keeper' which attaches to your | | | | your seat post fits inside the tube so that is not the |
| bicycle to prevent your chain falling off the inside of | | | | diameter that you want! |
| your smallest chain ring. Many pro mechanics are now | | | | The Fang is fitted to the bottom of your seat tube, |
| fitting them to team bikes. | | | | below your front derailleur. |
| The chain can fall off the inside chain ring on even the | | | | If you have a bike with a non-circular tube, or one that |
| best adjusted bike. It may not happen often, but when | | | | is an unconventional size, then you are out of luck. The |
| it does happen, it always seems to be at the worst | | | | devices are available in 3 sizes: 28.6 mm, 31.8 mm, and |
| possible moment, for example on a steep hill. You | | | | 34.9 mm. |
| have to stop to put the chain back on, you get oil | | | | I dropped my chain 3 times in one ride recently, each |
| stains on your fingers and then you struggle to get | | | | time on a steep hill. Result: dirty hands and frustration! I |
| moving again. | | | | fitted a Dog Fang to my bike after that. Since I fitted |
| How much better would it be to be able to power | | | | the device, I haven't fluffed a chain ring change. I've |
| your way into the hill in a high gear, confident that you | | | | looked at the Fang after riding and I can see oily |
| could safely change to your small chain ring when you | | | | marks on it, so the chain definitely falls onto it from |
| needed to? | | | | time to time, but it then obviously slides back onto the |
| The chain keepers are available in three sizes and you | | | | chain ring where it should be. |
| must make sure that you get the right one for your | | | | The devices don't cost much, they don't weigh much, |
| bike. Measure the diameter of your seat tube (if you | | | | they aren't particularly noticeable unless you look for |
| don't know it and can't look it up on the bike | | | | them so they don't spoil the appearance of your bike |
| manufacturer's website). I found the size of my seat | | | | and they do what they are supposed to do. They get |
| tube by closing a big adjustable spanner on it and then | | | | my 100% recommendation! |
| measuring across the jaws of the spanner. Crafty, | | | | |