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-   -   Some dumb questions about bike fit. (http://www.bikeforums.net/bmx/817924-some-dumb-questions-about-bike-fit.html)

Mexican Street Dog 05-14-12 03:23 AM

Some dumb questions about bike fit.
 
Hey, I'm looking to get my first BMX bike and I'm wondering how to get one that fits.

I'm 6'2" and 170lbs. The difference in top tube length is so small, from 20" to 21", it seems weird to me that it can make that much difference. I'm guessing I need one on the longer end. Do I need to get the longest? Or will a 20.5 work?

Also, how about handlebar height? There are so many variations, stem up or down, and the size of the handlebar itself.

Thanks for answering a noobs questions, sorry if these are already answered somewhere else, i couldn't find them.

Street rider 05-14-12 01:32 PM

Yea, the longer the tt, the better for you. Bars are personal preference, be it shape, height, color, width, etc. The current trend is really tall and reeeally wide. But its all up to you.

michaelscycles 05-14-12 06:40 PM

The right one is whatever feels right to you. I would suggest a 21" top tube and a 8 1/2" rise bar.

IthaDan 05-14-12 07:39 PM

Back in the day you'd be riding a s&m Holmes or a standard lengthy. I think those are 21" TTs, but a quick google could tell for sure. I used to ride 9" bars with a cruiser stem, which had the clamp under the main plate, so a 8.25 should do nicely.

JonathanGennick 05-15-12 05:12 AM

Quote:

Originally Posted by Mexican Street Dog (Post 14219676)
The difference in top tube length is so small, from 20" to 21", it seems weird to me that it can make that much difference.

I too have wondered about the above. What is the theory on fitting? What position is one trying to achieve on the bike in which a half inch matters? How does one hone in on a size without just randomly choosing one and then riding it to see whether it works out?

Mexican Street Dog 05-15-12 06:11 AM

Yea, that's what I'm wondering. How does that inch make a difference. I can see that, me, being taller would want a longer frame but, why? I think I'm missing something. Also, being absolutely new to BMX, would I even notice? I ride a mountain bike alot but I'm looking forward to learning some BMX moves, flatland stuff, street, and going to the pump track.

Does it seem that, being a complete noob, I wouldn't know the difference until I picked up alot more skill?

Thanks for all the answers guys, it's helping.

JonathanGennick 05-15-12 06:24 AM

Quote:

Originally Posted by Mexican Street Dog (Post 14224794)
I ride a mountain bike alot but I'm looking forward to learning some BMX moves, flatland stuff, street, and going to the pump track.

I admire people with the skills to make those moves.

I also mountain-bike a lot. A couple seasons ago I built up a Giant STP 26er rigid bike just to play around with in the skate park down the street. Hey, it's only two blocks away, right?

What little I've done at the park has fed back wonderfully into my mountain-biking. I'm more comfortable with air now, and it's all down to practicing on that tabletop jump in the skate park. And going up and down the quarter-pipe has improved my comfort level at rolling steep things on the trails.

Don't get me wrong. My skate-park skills are laughable. But even so, my mountain-biking has improved.

A couple of the BMXers ride with me on trails now. Wow. Talk about your bike-handling skills.

Mexican Street Dog 05-15-12 07:42 AM

I ride a 1x9 rigid frankenbike built on a Cannondale frame from the '90s, it built up at 23lbs, the lightest bike I've ever owned. Of course you can get dual suspension bikes that weigh less than that, haha. I haven't learned to jump, I can bunny hop a foot and a half and manual foot high drops, though I can't maintain a wheelie or manual for more than a couple yards. I'm looking for something new, and like you say, I think BMXing will work over into my MTBing.

Anyway, I'm going, today, to get a Fitbikes BMX, the store has three different ones all around $350. It really cuts into my trials bike savings but, what's money for anyway? And I always need another bike, I can't wait to get schooled by 12 year olds at the park!!

Street rider 05-16-12 03:11 PM

What bike are you buying? Unless they're on sale, the 350 price point isn't going to get you a great Fit. There can't be much chromoly in there.

proileri 08-19-12 11:26 PM

So, how did it go, Mr. Dog? I'm interested because I'm around the same size myself and looking to get a cheap BMX to try it out :)

Street rider 08-20-12 06:28 AM

Quote:

Originally Posted by proileri (Post 14627115)
So, how did it go, Mr. Dog? I'm interested because I'm around the same size myself and looking to get a cheap BMX to try it out :)

Buy nice, or buy twice.

grimcow 11-16-12 12:25 AM

Quote:

Originally Posted by Street rider (Post 14627637)
Buy nice, or buy twice.

nice saying.. its really too bad.. Im like the exact same height and weight and always wanted to try bmx but would rather drop a couple hundred bucks elsewhere :( wish I would hit some oil in the backyard. Oh wait I rent.

hos13 04-19-13 11:32 AM

BMX is has a naming convention that goes with there sizes.

20 inch bikes

mini
jr
jr expert
expert
jr pro
pro
pro xl
pro xxl
pro xxxl


The components usually keep the same convention and scale with the size. Check out this link

https://www.jrbicycles.com/sizingcharts/frames.html

I'm 5'10" and ride a pro xl although I probably could go up to a pro xxl frame

hope this helps

Street rider 04-19-13 12:11 PM

Quote:

Originally Posted by hos13 (Post 15529417)
BMX is has a naming convention that goes with there sizes.

20 inch bikes

mini
jr
jr expert
expert
jr pro
pro
pro xl
pro xxl
pro xxxl


The components usually keep the same convention and scale with the size. Check out this link

https://www.jrbicycles.com/sizingcharts/frames.html

I'm 5'10" and ride a pro xl although I probably could go up to a pro xxl frame

hope this helps

Those sizes are for race frames. Street/park/trails frames are sized in inches. And he never said anything about racing, sort of making your "sizing list" irrelevant.

IthaDan 04-20-13 01:19 PM

Quote:

Originally Posted by Street rider (Post 15529559)
Those sizes are for race frames. Street/park/trails frames are sized in inches. And he never said anything about racing, sort of making your "sizing list" irrelevant.

Easy buckshot. The S&M frames would follow this sizing as well- the dirt bike was an XL, the holmes was a XXL

you still see "race" sizing in Jumping freestyle frames. Knowing this is useful, why would you dissuade someone from posting useful information?

Street rider 04-20-13 01:54 PM

Quote:

Originally Posted by IthaDan (Post 15532601)
Easy buckshot. The S&M frames would follow this sizing as well- the dirt bike was an XL, the holmes was a XXL

you still see "race" sizing in Jumping freestyle frames. Knowing this is useful, why would you dissuade someone from posting useful information?

Go to Danscomp, pick any street/park/trails frame, look at the sizing options. Including every S&M frame on there. How recently did you see a race size for a frame not designed for the track?

This thread was only started a few months ago, and the OP said he was looking to get himself a bike. Meaning he would most likely be looking at something much newer, making race sizing on any older S&M frames (or any street/park frame that may have used that sizing at one point in time) irrelevant, as I said.

IthaDan 04-20-13 02:00 PM

Knowledge is never irrelevant, you just want to be right.

I get your point, but knowing a xl has a 21" TT and working your way up and down from there, is NOT irrelevant. Perhaps there's a sizing chart for race sizing that could cross over to freestyle bikes? regardless, turning people away, especially in a subforum as lightly trafficked as BMX just because your ego is hurt seem doesn't seem much more than selfish and immature.

What if there's a craigslist ad that lists an FBM/EASTERN/S&M "XXL" sized bike. Should we email the seller and tell them that bikeforums user "Street rider" says their sizing is irrelevant and they should get with the times?

Street rider 04-20-13 02:45 PM

I use 'irrelevant' in terms of this specific thread. He never said he was looking for a race bike. I get that knowledge is relevant, but his advice on sizing was in this instance. And they've been around a long damn time, so I'm sure I didn't "turn them away".

And as for the craigslist thing, thats just stupid. I know you're being sarcastic, but really. Its the CL sellers own fault, and that will either turn people off of buying it, or he's going to get flooded with emails asking for an actual size. Simple as that.

CbadRider 04-21-13 11:04 AM

This thread is almost a year old; I'm sure the OP has found his bike.

Closed.


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