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Proper DJ frame size for 6"?

PB Forum :: Dirt Jumping & Street
Proper DJ frame size for 6"?

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flag jesusphotography
Posted: Aug 9, 2016 at 9:19 Quote
Hey guys, I've been doing a fair bit of research on height vs frame size, but I haven't been able to find consistent information about frame sizing specifically for DJ bikes. I'm 6 ft tall - what frame size should I be looking for?
Thanks in advance!
flag bikebike69
Posted: Aug 10, 2016 at 7:51 Quote
23" top tube would "probably" be perfect.
flag cmc4130
Posted: Aug 10, 2016 at 9:09 Quote
jesusphotography wrote:
Hey guys, I've been doing a fair bit of research on height vs frame size, but I haven't been able to find consistent information about frame sizing specifically for DJ bikes. I'm 6 ft tall - what frame size should I be looking for?
Thanks in advance!

Large.

In general:

Small -- 21.5" actual top tube
Medium -- 22"
Large -- 22.5"
XL -- 23"

photo

"Actual" top tube measured center to center along top tube:

photo

"Reach" (some people call "cockpit") is actually the most informative m[/P]easurement for D[/P]J, because where you sit is irrelevant, and seat tube angle changes will throw off the actual top tube measurement comparisons. Many companies don't publish a "Reach" number, though. Transition does.

photo

"Effective top tube" is the horizontal line at the top. It measures to where the seat would be if it was at that height.

photo

photo

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DJ / Street Bike Size
https://www.pinkbike.com/forum/listcomments/?threadid=150209

Dirt jump frame for tall rider
https://www.pinkbike.com/forum/listcomments/?threadid=167638

frames with similar geometry to P3
https://www.pinkbike.com/forum/listcomments/?threadid=169246

ISN’T THAT BIKE A BIT SMALL FOR YOU MATE?
POSTED BY GEORGE ON MAR 1, 2005
http://www.odysseybmx.com/dailyword/2005/03/84-isnt-that-bike-a-bit-small-for-you-mate/
flag jesusphotography
Posted: Aug 11, 2016 at 11:14 Quote
Thank you guys this is very helpful!!! Much appreciated
flag BlueCollarNobody
Posted: Aug 11, 2016 at 21:45 Quote
cmc4130 wrote:
jesusphotography wrote:
Hey guys, I've been doing a fair bit of research on height vs frame size, but I haven't been able to find consistent information about frame sizing specifically for DJ bikes. I'm 6 ft tall - what frame size should I be looking for?
Thanks in advance!

Large.

In general:

Small -- 21.5" actual top tube
Medium -- 22"
Large -- 22.5"
XL -- 23"

Unsecure image, only https images allowed: http://i255.photobucket.com/albums/hh138/upsetbmx/cockpitsize-blackmarketsoldier.jpg

"Actual" top tube measured center to center along top tube:
Unsecure image, only https images allowed: http://fortytwobmx.com/Bmxtech_pics/bmxtech_Frame_geometryl_01.jpg
"Reach" (some people call "cockpit") is actually the most informative measurement for DJ, because where you sit is irrelevant, and seat tube angle changes will throw off the actual top tube measurement comparisons. Many companies don't publish a "Reach" number, though. Transition does.
Unsecure image, only https images allowed: http://www.sicklines.com/news-images/reach_stack.jpg
"Effective top tube" is the horizontal line at the top. It measures to where the seat would be if it was at that height.
Unsecure image, only https images allowed: http://i859.photobucket.com/albums/ab160/broadwingllc/GEOMETRY/GEOMETRY2.gif
photo

Unsecure image, only https images allowed: http://i255.photobucket.com/albums/hh138/upsetbmx/YessBMX_seattubeangle_zps31eq2a1f.jpg
DJ / Street Bike Size
https://www.pinkbike.com/forum/listcomments/?threadid=150209

Dirt jump frame for tall rider
https://www.pinkbike.com/forum/listcomments/?threadid=167638

frames with similar geometry to P3
https://www.pinkbike.com/forum/listcomments/?threadid=169246

ISN’T THAT BIKE A BIT SMALL FOR YOU MATE?
POSTED BY GEORGE ON MAR 1, 2005
http://www.odysseybmx.com/dailyword/2005/03/84-isnt-that-bike-a-bit-small-for-you-mate/

cmc4130 you have the best replies. It"s crazy how often the same questions is ask that you have built these answer templates to explain. Granted the last guy was , I think, 6'3" but the answers the same.

Great job and an amazing demonstration of patience and understanding. Any moment now, I expect a question about bottom brackets to be asked. hehe!
flag cmc4130
Posted: Aug 12, 2016 at 8:39 Quote
BlueCollarNobody wrote:

cmc4130 you have the best replies. It"s crazy how often the same questions is ask that you have built these answer templates to explain. Granted the last guy was , I think, 6'3" but the answers the same.

Great job and an amazing demonstration of patience and understanding. Any moment now, I expect a question about bottom brackets to be asked. hehe!

heh, thanks. you know, one thing i've noticed is people sometimes say newbs should use the search function of pinkbike--but it's actually not very good. if i want to find something in the pinkbike forums, i go to google and write "pinkbike . . . [whatever]."

and one thing i've learned about Google is that pages that are linked to a lot of other links get much higher placement in search results. also, if i paste in four other links on the same topic into a post, google starts to figure out that they're related. so now, most of the time, if you type something like "dirt jumper bottom brackets," the top result is one of these pinkbike threads, with like 4 other pinkbike threads below it.

getting good knowledge about dirt jump mtb's out there seems needed, because it's kind of an overlooked genre, both by the mtb world and the bmx world. i grew up in skateboarding and bmx and magazines were like bibles; people put a lot of work packing the whole culture into them. now, i barely look at bike magazines (and dirt jump mtb's don't even have a specific magazine), but i kinda miss the dense information that was in them. it's pretty cool that now with good websites, riders can sometimes be even more informed than people in bike industry. Cool
flag Mothership-Rider
Posted: Aug 13, 2016 at 16:00 Quote
jesusphotography wrote:
Hey guys, I've been doing a fair bit of research on height vs frame size, but I haven't been able to find consistent information about frame sizing specifically for DJ bikes. I'm 6 ft tall - what frame size should I be looking for?
Thanks in advance!
there is no perfect size. You're around my height and i've rode really short like a 21.5 to a longer 22.5 and always found i just adjusted to them. On a bmx i've rode a 20.5 and liked it but then rode a 21 and been ok with it aswell. i'd say as you're gonna be running probably a 26", i'd get what ever length the ns soda slope uses. That is currently what i'm riding and it feels spot on. Of course you need to take into account the other geometry angles like chainstay length but honestly unless you go below a 21 or above a 22.5 i think you'll be fine. You can always get a longer or shorter stem to fine tune it. Just remember it's all personal preference.
flag cmc4130
Posted: Jun 19, 2017 at 9:09 Quote
bump - fixed links. pinkbike doesn't allow hotlinking to a lot of other photos anymore, so i've been saving them as pinkbike photos.
flag jacobwhite04
Posted: Nov 15, 2020 at 9:33 Quote
Im 5,11 and stuck between getting a medium or large gt labomba which size would you recomend?
flag MonkeyBicycle
Posted: Aug 19, 2021 at 8:05 Quote
Can't comment on the proper size, but I just got a long PBJ feels good on dirt jumps, but tried a friends NS Majesty (which is a fair bit shorter) at the pump track and that felt much better for that than my PBJ. If I was buying again, I'd go slightly shorter, but still happy with my long bike. (I'm a shade over 6ft tall)
flag cmc4130
Posted: Jan 12, 2022 at 12:55 Quote
I also just got a PBJ—Long.

Note that compared to Transition’s prior dirt jump model, the Trail or Park, the Small PBJ has a similar Effective Top Tube and Reach as the Large Trail or Park did.

Transition made the PBJ longer in the front, to keep up with their Enduro and Trail bikes which also became longer in the front.

photo
flag AF2NR
O+
Posted: Feb 27, 2022 at 9:08 Quote
jacobwhite04 wrote:
Im 5,11 and stuck between getting a medium or large gt labomba which size would you recomend?

I'm the same height and went with the L over the M after riding both around a little. As was mentioned earlier you sometimes get a better pumper with smaller and a little more jumping stability with larger ones.
flag bikebike69
Posted: Feb 27, 2022 at 11:20 Quote
cmc4130 wrote:
I also just got a PBJ—Long.

Note that compared to Transition’s prior dirt jump model, the Trail or Park, the Small PBJ has a similar Effective Top Tube and Reach as the Large Trail or Park did.

Transition made the PBJ longer in the front, to keep up with their Enduro and Trail bikes which also became longer in the front.

photo

photo
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