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Saturday, August 12, 2006

BMX REBUILD PART 2









This is the second and last part of the BMX rebuild. I have skipped a few steps in the illustrations since some other articles in this blog cover these. Another thing of note is that this was the first time I had to reassemble a threadless fork without having the benefit of prior disassembly. So don't go thinking that I am a court testifying expert on the subject. I reassembled it until it was solid, took me half an hour to figure out. The main difference with a threadless fork is that the gooseneck plays a major part in holding everything together. So make sure it is properly tightened and take note that the hex bolt on top of the gooseneck is just a cover plug, it has no mechanical value in the process.

When putting back a BMX together, or taking it apart, check if all the small hardware is up to snuff while you're there. While rebuilding this thing I found a frayed brake cable that had but one strand to live. This BMX only has one brake caliper, imagine the deception of it's owner when that cable would've snapped while trying to avoid hitting a bus or something!

So get dirty and have fun, until next time, ride safe.

46 comments:

Anonymous said...

hi could you help me i have a bmx and i removed the gyro but now the fork wobbleshow can i stop it??

Gerry Lauzon said...
This comment has been removed by the author.
Gerry Lauzon said...

Like I said in the article, this was my first threadless fork. You need to tighten the fork in place with the screw inside the steerer tube before locking in the stem. But I would really recommend going to your local bike shop to fix that if you don't know what you are doing for sure. That would be my best recommendation.

Gerry

Anonymous said...

hi first it's not a "gooseneck" it's a stem and that "hex nut" plays a very big mechanical part it's called a compresion nut it pulles all the parts of the headset together so it dont' wobble and then u clamp down the stem to hold it all in place it has many benifits over treaded systems firstly once fitted it wont come loose like treaded systems and also is stronger and also prevets the fork's treads from being striped out as there isn't any

Gerry Lauzon said...

Ah! At last someone with the right info. Thank you for the information, now everybody should be well informed.

Gerry

Anonymous said...

no worrys if ya need anymore information on thredless orks or any other bike info ( i know loads) just drop me a line at bikerdude1984@hotmail.co.uk

Anonymous said...

I have a really ugly bike, which is good because I live in Allentown, Pa. The tire was flat so dummy me took it apart. Now I can't find any pictures of the rear wheels so I can put the chain back in the right spot. I should have taken a picture first. Please help! I 'd rather have no gears, it's easier.

Gerry Lauzon said...

check out the article about removing a wheel. The link is on the left of the page. Just rest the chain on a gear and it should take care of itself.

Gerry :)

Anonymous said...

hi,this site is really useful.i have a little problem.i just bought anew BMX.i am trying to fix it but i cant. i cant work out how to fix on my handlebar. can u please help

Gerry Lauzon said...

I'll need a more specific question than that to help you out.

Gerry :)

Anonymous said...

im pretty sure i know what im doing but i need to make sure i know that right way to take off a gyro then reassemble it strongly with no wobble so if you got a way please let me know

Gerry Lauzon said...

Just look at the earlier comments of this post and you will see one from bikerdude who volunteered the proper information about these. I still don't have the hang of it and I have to work on this.

Gerry :)

Anonymous said...

hi,
i just bought a second hand bmx and the seat keeps coming loose even after i tighten the bolts.
i cant seem to find a new one to buy online.. what should i look for(call it)??

Gerry Lauzon said...

The seat is probably still good, it's the hardware that holds it to the seat post that is probably used up. You can take the hardware, nuts, bolts and clamp, from another seat and put it on yours. Worst case scenario, replace the seat.

Gerry :)

Anonymous said...

hi gerry lauzon and i have a bmx. while im driving the rear wheel pulls stiff. i have tried to fix it but nothing works. could it be the bearings. please help!!!!!!!

Gerry Lauzon said...

Pull the wheel off and see if it turns freely while holding the axle with your hands. The only other thing I can figure out would be that the tire is rubbing on the frame.

Gerry :)

Anonymous said...

Hi, i have removed the GYRO from my BMX but now my forks wobble. Can you help me???.

Gerry Lauzon said...

Check out the comments on this post. There is a very well explained procedure involving the stem bolt that will prevent that wobbling.

Gerry :)

Anonymous said...

thanx for the help but u should probably mention when put on the tire and how to check if the tube has a hole!!
if u take my advice ur website will go better!! :)

elliott said...

hi, awesome blog you have, im trying to take some forks off a frame, nearly the same as the set up in your step by step, do i need to tap it out with a hammer? i cant see any thread or 'nuts'.

thanks.

Gerry Lauzon said...

Thanks for the great comments. If you have a threadless fork like in the article, that screw on top must be removed out of the stem. Hammering it will only push it down and jam it in there good.

Gerry :)

Anonymous said...

Dear Anonymous,
I had this same problem on a old GT and u just have 2 tighten the clampish-screws in the gyro settup. You can do this with ur hands! Good Luck

deck said...

HELLO CAN ANUBODY HELP ME?
I HAVE JUST TAKEN THE HEADSET OFF MY BMX AND NOW WHEN I PUT IT BACK ON ITS REALLY STIFF WHEN I TURN AND ITS SEEMS TO TURN IN LITTLE SECTIONS! ANY HELP PLEASE? CHEERS

Gerry Lauzon said...

deck, your adjustment screw on top is too tight.

Gerry :)

Anonymous said...

hello, im only 13 and i just started to fix up one of my old bikes well anyways,on the front of the frame the very bottom part of the gyro is stuck on,my friend said just to use a hammer but its not working and i dont want to brake it. how do i get it off?

Gerry Lauzon said...

Sorry young man, I can't really help you if I can't see the part itself. Have you tried a big pair of pliers? Maybe the gyro is crooked or rusted in? Was the bike left outdoors for long? Lot's of things you have to consider. Good luck and don't give up.

Gerry :)

Anonymous said...

Can you please help me. I am 13 years old and I love jumping and just cruising around the neighborhood with my redline BMX bike. I toke my seat of, and now i am having trouble getting it back on the bike. The seat has rails on the bottom of it, and there are barrings and stuff to put the seat on the seat post. So, If you no what to do please Email me at motoxkid71@aim.com. Thanks if you can help or advise!

Anonymous said...

I have an old mongoose bmx bike from when i was little with mongoose labeled frame and tred on the tires. i was wondering if you could tell me how to remove the pedal brake so i can really use it as a bmx bike.

Gerry Lauzon said...

You'll have to replace that wheel with one that has a freewheel hub.

Gerry :)

Anonymous said...

Thanks! I have one more question. The Chain on the bike always likes to fall off even when i move the wheel further away so theres more tension. Doing this makes it better for longer but it still comes off. do i need to re-align the gears the chain goes around? How?

Thanks a BUNCH!!

Gerry Lauzon said...

Make sure your chain line is straight by eye balling it. Also check and see if your chain ring isn't crooked or wobbly. Those could be the cause.

Gerry :)

Anonymous said...

i got a new double h frame and it had wheels and i tried to put them on but the i need to move the back screw thing over how do i do this

Gerry Lauzon said...

Sorry, I can't understand the question clearly.

Gerry

Anonymous said...

hi got a new bmx wheel and on one side the bolt is stuck on can u help plz dont no how i cn get it off

Gerald said...

Get a product called "release all" and spray the bolt with it. Leave it for an hour and then try to remove it. That's the only solution I know short of replacing the axle.

Gerry :)

Kyle said...

Hi..i tightened what i think is the stem bolt, because i thought it would help the handlebar to stay in line with wheel..it worked but then i tightened it again and it popped..and now the fork is wobbly..how do i go about fixing this?? (i have now learnt you have to tighten the gyro to keep the handlebars in line with wheel)
Thanks!

Gerald said...

Sounds like you need to replace the bolt itself. What keeps the handlebars aligned are the two bolts on the side of the Gooseneck.

Gerry :)

Anonymous said...

haha im a real bmxer and im not being offensive but dont call it a gooseneck its a stem p.s i have a amasin bmx proper wheels primo hubs wethepeople fraim and some hhhhuuuugggeee s&m slams xlt

ROB said...

i cant get the bearing cover to go back on, i put the foorks through drop the cover over and have to wedge on this plasitic ring with a cut in it to make it go tight but it wont. help.

Gerald said...

Real BMXER, no offense taken, you are absolutely right. Rob, I'm sorry but I can't really help you out here.

Gerry

Trevor said...

My front fork wabbles with my handle bars.. what do i do to fix this and prevent it in the future

Anonymous said...

i bought a new cassette hub and laced it then put it on my brothers bike. the rim is completely true and the hub is working good. but the chain wobbles back and forth when you peddle. what would you recommend?

Gerry Lauzon said...

Either the gear is not properly tightened on the cassette or your wheel is not set properly in the frame to give proper chain tension or your chain is too long. Apart from that, I don't see what else could be wrong.

Gerry :)

Anonymous said...

hi garry i just took the gyro of my bmx and know i can't remember how to put it all back together

Anonymous said...

hey i'm really starting to get into fixing up bikes. i go to the local parts yard and find some really nice parts. right now i'm trying to fix a bmx bike up. it has pedals cranks seat. i cant figure out how to put the fork on. also would it be okay to put a mountain bike handle bars on could you help me?

-jon joss

Gerry Lauzon said...

Hey Jon, I don't get what you mean by pedal crank seats. As for the fork, look up the link to the article posts on top of the blog. I have another article on fork assembly.

Good Luck

Gerry :)