Newb help with bike build

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1/29/2017 8:07 AM

Have done some searching but, still a little lost. My 9yr old son is really wanting to get into bmx racing. He's almost 5' tall and around 70lbs. I have been out of the sport since the mid 90's and a lot has changed. We like building things together and want to give building a bike a go. It seems a lot of kids at the local track are using ghp frames. I've been doing research and for my sons size, the expert seems to be what is recommended. Now, here is we're I get lost. I have no idea how to choose fork size, wheel size, crank size, etc. is there anywhere I can get an idea of what components go together and the proper sizes I would need to complete this build? I live in south Florida and our only bmx shop closed down years ago. Everything will most likely be ordered online and can't really see it in person. Thanks for any help

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1/29/2017 10:11 AM

20" wheels are standard size for a bmx, although some racers go with a narrower rim and smaller tyre. I can't remember the exact size but they measure up smaller overall than a normal 20" wheel (the overall circumference of the wheel is smalle due to a shallower tyre).

You can get forks specifically for the narrower tyres, but normal forks will fit either wheel size.

That frame has an integrated headtube so you need an integrated headset.

Chances are it has a euro bottom bracket, so an external bottom bracket with 2 piece cranks would be ideal (like shimano hollowtech II)

I'm not very up to date with bmx racing though. Your best bet is to find a shop that specialises in race bmx and ask their advice, they can probably get hold of everything you need too

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1/29/2017 5:51 PM

Thanks for the reply Steve. Going to look into the BB type and also going to look into the crankset. 2 piece didn't even cross my mind. So used to crankset being 3 piece. Unfortunately there are no local bike shops that specialize in bmx around here. Wish I could find one close enough where we could size things out.

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1/30/2017 9:38 AM

The 20" wheels on "mini" style bikes are actually larger in diameter than normal 20" wheels so make sure you get the right kind. You might be better off just buying a complete, so he can replace parts as he goes along, and figure out what he likes best. Most sizing is all about personal preference, but to figure out what you like it's all trial and error.

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1/30/2017 11:08 AM
Edited Date/Time: 1/30/2017 11:09 AM

I also live in south Florida and my son who is 6 is just starting bmx! Awesome dude! And yes, we do not have any shops around anymore. Unfortunately they've been gone for good for a long time

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1/30/2017 11:22 AM

ggallin422 wrote:

The 20" wheels on "mini" style bikes are actually larger in diameter than normal 20" wheels so make sure you get the right ...more

This is correct. It's 20 x 1 3/8ths which is more for mini bikes (like a smaller version cruiser). The rim has a larger diameter but the tyre has a smaller side wall. They still come up a little larger overall diameter than standard 20". So you'd need the standard 20" wheels.
Find an online store that has plenty of race stuff and familiarise yourself with the different things out there. Cross reference the parts with the spec of the frame, you'll learn quite a bit that way. And just call the shop if you have any doubts

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1/30/2017 3:56 PM

ggallin422 wrote:

The 20" wheels on "mini" style bikes are actually larger in diameter than normal 20" wheels so make sure you get the right ...more

Thanks for the advice. I can't leave anything factory, lol. Cars, trucks, boats, bikes, etc. I'm afraid if I were to buy a complete, within a few weeks the only thing factory would be the frame anyways. My son and I like to build things together anyways , so figured why not build a bike. I'm searching to build myself a cruiser as well. Lol

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1/30/2017 5:45 PM

seanthemechanic wrote:

I also live in south Florida and my son who is 6 is just starting bmx! Awesome dude! And yes, we do not have any shops around ...more

Yep. Not sure how far south you live but, we had night bikes down here for many years. I used to get all my bmx stuff from them. I used to race a lot myself at pine ridge( Miami south) and magic mountain in homestead. So glad my son is wanting to get into as well. We have been going to the track and it sure does bring back some memories. Good luck to you and your son. He's going to have a blast.

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2/1/2017 12:37 PM

Danscomp.com has a huge selection of race bikes and parts. I don't race personally but I buy pretty much all of my parts from them and know that they are very helpful and knowledgeable when it comes to anything bmx related. Customer service is great and you can use coupons to save some cash as well.

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Fo' pegs or no pegs