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Rear Disk Brake, Is It A Good Idea Or Not?


JumpyJames

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I am getting back in to trials after a few years off, but don't know if it is a good idea to ride using a Hope Mono M4 on the rear wheel, as I am fearing that it might snap or break the spokes due to the forces applied to it.

Would it be safe to use it for a short time or fine for a long time?

Or should I get a magura for the back (as the frame has magura mounts)?

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Running on a DMR Trailstar at the moment, it's not going to be super light weight, more of an old school build. It is the only set of breaks I have at the moment, until I find some cash for a rim break. But I don't know if the brake is up to the job for trails.

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The problem with that brake is it is designed for XC/Downhill, where you don't really want the brake to lock up if you can help it, so they were designed with loads of modulation in mind.

By all means try it out, it won't break the spokes though, but if your changing it for another disc, get a Mono Trial. Apparantly BB7s don't work well on the rear.

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Yea as Muel says the M4 will feel pretty hard work compared to an mono trial. Becuase it will have loads of power but could feel rather "spongey" to get it to a locking point. What size rotor are you going to run? If its going to be a fairly heavy build the bigger the better

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Currently I am running 180mm on the M4, so would look at 160mm to 180mm if using a Mono Trial.

I have never used v's for trials riding before, are there any trials specific ones available?

No you would need the 180 on a heavy bike, possibly even a 200 depends how much lock you prefer.

There are no trials specic V brakes, genrally use CNC'ed backed trials specific pads, a good slick cable, some nice arms like XTR and a good lever. Some levers have a "tpa" function so you can set them up nice and tight

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If you can fit a 200mm rotor, definately go for one! I have a 180 and it's enough, but you can never have too much brake power, especially in rainy/muddy conditions.

My caliper is mounted between the seat stays and the chain stays, so a 180 is the biggest you can get in there unfortunately.

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