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Old 11-26-05, 12:36 AM   #1
gromitz49948
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What makes a dirt jumping bike?

I was curious about how dirt jumping bikes are different than regular hardtails. I know the geometry is different, but is that what makes a jumping bike or the components, fork, frame. Is it any better to jump on either bike. Can i turn a hardtail into a jumping bike? Thanks for your opinions.
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Old 11-26-05, 12:47 AM   #2
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I can't tell you which one to buy, but DJ bikes are built with......

1. Stiff strong frame
2.strong fork with stiff springs to deal with errant landings
3. other strong components to deal with landings/ crashes (handlebars, cranks, wheels. etc)
4. Usually a single chainring up front, usually a chain guide mount
5. little regard to weight savings
6. the ability to drastically lower your seat ( short seat tube)

Don't build a cross country frame and Dj it. I had a CAAD 5 frame that lasted me six months ( i got lucky i guess) from doing the stuff you plan on doing. Don't make the same mistake I did.
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Old 11-26-05, 12:53 AM   #3
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i think you will find that top of the line dirt jumping rigs have...
1. fast rolling and grippy tires with even tread
2. single crown froks 80mm-120mm (thru axle for hard hitters)
3. short chainstays
4. steep head angle for fast steering
5. short stem w/ riser bars
6. broad saddle
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Old 11-26-05, 12:54 AM   #4
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it'd be hard turning a carbon cross country frame into a dirt jumping/street machine
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Old 11-26-05, 12:59 AM   #5
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it'd be hard turning a carbon cross country frame into a dirt jumping/street machine
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Old 11-27-05, 02:13 AM   #6
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in essence a DJ bike is really strong and really beefy, pretty much built to take abuse.

generally you see them rocking only the rear brake, and a lot of them are single speed. Smaller amounts of travel in the fork and beefy
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