mountain bike conversion
#1
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mountain bike conversion
I don't know very much about bikes but i had this idea for a bike I want to convert.
I have this old mountain bike frame that I really like that I want to keep, but then I was wondering if I could attach a bmx gyro so i can spin the handle bars and change it to a single gear that is able to spin backwards too. Finally I want to add a disk brake in the back.
All I want to know is any of these things possible and if they are how can I do them?
thanks
I have this old mountain bike frame that I really like that I want to keep, but then I was wondering if I could attach a bmx gyro so i can spin the handle bars and change it to a single gear that is able to spin backwards too. Finally I want to add a disk brake in the back.
All I want to know is any of these things possible and if they are how can I do them?
thanks
Last edited by benokkema; 06-15-09 at 01:08 PM.
#2
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Sure it could be possible, actually it would be really neat. Are the front sprockets multi-speed? If so you might want to convert it to a single if the you are going to a free single in the back. Just remove the cassette and install a single gear and change the the headset (the bolts and rings that keep the fork attached to the frame) to the BMX Gyro variety.
I say go for it, post some pics of the Mountain bike.
I say go for it, post some pics of the Mountain bike.
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Okay, thank you. And yes, the front sprocket is multi speed. My dad said he was going to help me with the conversion to single speed. I'll post some pictures shortly.
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Then again, BMX isn't my strong side. I could be wrong, or there might be gyros out there that will work on threaded forks. And, assuming its an 1 1/8" fork, (which it looks like) you could replace it with the more common aheadset-type fork used these days. Then fitting a gyro should be just as in the manual I've seen. Will require some more work and some more bits though.
Probably your biggest challenge, unless your father can weld. That frame haven't got any disc brake mounting tabs. There are some adapters available, but they're generally rather kludgy looking. A rear disc brake would be another reason to look for a new hub/wheel.
You should be able to keep your cranks. The chainrings you don't want can be unbolted. You might want to get rid of that biopace chainring in favor of a standard chainring with a tooth count more suited for singlespeeding.
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Form the assembly instructions I've seen, I don't think a BMX gyro will work on a threaded fork, which you have.
Then again, BMX isn't my strong side. I could be wrong, or there might be gyros out there that will work on threaded forks. And, assuming its an 1 1/8" fork, (which it looks like) you could replace it with the more common aheadset-type fork used these days. Then fitting a gyro should be just as in the manual I've seen. Will require some more work and some more bits though.
Not entirely clear what you want to do here. Looks like you have a 6-speed freewheel on there right now, in which case you should be able to fit a SS freewheel fairly easy. You'd have to either cold-set the frame, or get creative with spacers to fill up the drop out width probably. If you're looking to be able to pedal backwards a new hub that can take a lockring is recommended.
Probably your biggest challenge, unless your father can weld. That frame haven't got any disc brake mounting tabs. There are some adapters available, but they're generally rather kludgy looking. A rear disc brake would be another reason to look for a new hub/wheel.
You should be able to keep your cranks. The chainrings you don't want can be unbolted. You might want to get rid of that biopace chainring in favor of a standard chainring with a tooth count more suited for singlespeeding.
Then again, BMX isn't my strong side. I could be wrong, or there might be gyros out there that will work on threaded forks. And, assuming its an 1 1/8" fork, (which it looks like) you could replace it with the more common aheadset-type fork used these days. Then fitting a gyro should be just as in the manual I've seen. Will require some more work and some more bits though.
Not entirely clear what you want to do here. Looks like you have a 6-speed freewheel on there right now, in which case you should be able to fit a SS freewheel fairly easy. You'd have to either cold-set the frame, or get creative with spacers to fill up the drop out width probably. If you're looking to be able to pedal backwards a new hub that can take a lockring is recommended.
Probably your biggest challenge, unless your father can weld. That frame haven't got any disc brake mounting tabs. There are some adapters available, but they're generally rather kludgy looking. A rear disc brake would be another reason to look for a new hub/wheel.
You should be able to keep your cranks. The chainrings you don't want can be unbolted. You might want to get rid of that biopace chainring in favor of a standard chainring with a tooth count more suited for singlespeeding.
I agree with taking off the chainring and getting a new wheel/hub. the problem would be disc brakes. that would need a new hub or if you are not worried about drilling into the frame that would work
actually some gyro headsets accept threaded mounts, I have an old Huffy that has these componenets.
What kind of style are you going for, are you looking for practical or a tricked out bike, becouse you can do some cool things with forks
Last edited by dragsterIII; 06-17-09 at 11:48 AM.
#7
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Gyro came out before anyone was doing 1 1/8" or threadless.
And I'm guessing that when you're saying "single speed" you mean "fixed gear", because by "spin backwards" I think that you're saying that when you pedal backwards, the bike moves backwards.
And I'm guessing that when you're saying "single speed" you mean "fixed gear", because by "spin backwards" I think that you're saying that when you pedal backwards, the bike moves backwards.
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i think he means he still wants the free wheel to work
#9
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Well if that's the case then you can easily still do that with a multi-speed.
Personally, I'd go with an average ring up front (42) and a tight freewheel in the back (a 6-7 speed, say 14-23)
Also, unless you can do barspins, don't mess with a cable detangler, it'll just make the braking mushy and be hard to adjust.
Personally, I'd go with an average ring up front (42) and a tight freewheel in the back (a 6-7 speed, say 14-23)
Also, unless you can do barspins, don't mess with a cable detangler, it'll just make the braking mushy and be hard to adjust.
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What I could tell from the assembly instructions, a gyro adds some height to the headset stack. Threaded forks are usually cut to length very precisely, so trying to add a gyro afterwards might not leave enough threads for the locknut to engage. But sure, if there isn't any issues with clearance or stack height there's no reason why a gyro wouldn't work with a threaded headset.
#11
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What I could tell from the assembly instructions, a gyro adds some height to the headset stack. Threaded forks are usually cut to length very precisely, so trying to add a gyro afterwards might not leave enough threads for the locknut to engage. But sure, if there isn't any issues with clearance or stack height there's no reason why a gyro wouldn't work with a threaded headset.
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If a rotor/gyro is mounted in a way that doesn't add height to the headset stack, then I'm obviously missing something in the assembly instructions, so please explain how they're put together then.
#14
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I never said that it couldn't be done, only that the assembly instructions that I've seen made it look like a rotor/gyro would add to the stack height of the headset, and that threaded forks are usually cut rather precise.
If a rotor/gyro is mounted in a way that doesn't add height to the headset stack, then I'm obviously missing something in the assembly instructions, so please explain how they're put together then.
If a rotor/gyro is mounted in a way that doesn't add height to the headset stack, then I'm obviously missing something in the assembly instructions, so please explain how they're put together then.
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Therapy Components makes an adapter that mounts to the left canti stud on your seat stays, but as stated previously for the price, plus new disc-compatible hub, effort, etc.... you might be better off looking into a bike that is closer to what you want. No reason not to clean up and use that old school whip though. It would make a great beater commuter/utility bike!