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Horizontal Drop Outs - Anyone Had This?


FunkySquirrel

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My first post here! :) As a bit of background, mountain biking used to be my life. I regularly rode cross country, downhill and a bit of street every now and again with a couple of mates. Unfortunately as I entered my twenties, other things in life took precedence and my bikes remained tucked up in the garage ... until now!

A mate and I have decided to get fit again and we've rediscovered mountain biking ... I had forgotten how addictive it is! Anyway, he has been busy upgrading his ride and as he rides mainly trials/street, I thought I'd invest in an Onza Zoot. It's a lot lighter than my 24 Le Toy III, is chuckable and has 24" rims, which I prefer :)

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Now I'm not the lightest of people, weighing in at 16 stone, albeit I'm hoping to lose quite a bit by riding. However I noticed that whilst out on one ride, the rear wheel slipped in the horizontal drops out, making the chain rather slack. Long story short, I fixed it ready for the next ride. During the next ride, when I went to pedal it slipped again, although this time causing some damage ...

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Has anyone seen this or done similar themselves? Is it something I've done wrong, or am I just too heavy? :D My mate and I are thinking of making up some aluminium plates and drilling them into the drop out area, effectively making a fixed drop out, similar to my unmodified 24 below ... Should do the trick! :)

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Anyway, I'll check out the rest of these boards soon ... I'm starting out with trials and can do a few basic tricks n' stuff, although wheelie hopping still evades me!

Cheers!

Chris

Edited by FunkySquirrel
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Quick extra bit of info as we've seen this before and found the solutions... The tensioners aren't designed to resist pedalling forces, the rear wheel axle bolts are for that job. While the Gusset ones are strong enough to take this abuse, they shouldn't really be subjected to it.

If you put some decent grease on the thread of the bolt, a washer under its head, and grease on this washer, this will allow you to produce more clamping force and therefore transmit less load to the chain tugs. With this done, you can use any old crappy tugs and they won't bend - they only die when the axle bolts aren't clamping tightly enough.

If the bolts in the rear hub aren't already, try and get some 12.9 grade ones (this will be stamped on the head).

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Awesome! Thanks for the advice and thanks to Adam @ TartyBikes for the additional information ... I've ordered some Gusset tugs from TB and I'll set about sorting the axle bolts as soon as the tugs arrive :) Now the weather is improving, I just want to get out and ride ... and improve my very limited skills! :D

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