Wooden jumps. design, arc, height, dimensions etc.

Author	Message

hotrodmarlin

Posted: Jun 24, 2016 at 7:15

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We've built a bunch of small wooden jumps that are 4'-5' tall with 6' radius in the picture below. They are neat little jumps but now it's time to build some large wooden senders for enduro/DH bikes. I'm thinking about 8' tall with a 10' radius? Working large dirt jumps to get them right is fairly easy but I don't want my wooden ones to look like a hack job. Is there a radius or rule of thumb in the jump building world that I need to make sure I follow? Any help would be appreciated.

Oscarmckean030

Posted: Jun 24, 2016 at 9:44	Quote
Looks great, I think for downhill biking the jumps look a little to short in my opinion. It really depends on the speed. If u got much speed then I wouldn't build them to high. Maybe 6' and a 60-75 degree angle. And Maybe about 10' long.

hotrodmarlin

Posted: Jun 24, 2016 at 12:36	Quote
Thanks- Yes I was just showing what we've built so far. These jumps are more like DJ's. I'm looking for info on building much bigger ones for big bikes. We will have all the speed we want.

allsk8sno

Posted: Jun 24, 2016 at 13:57	Quote
Big bike, you will want more like 12' radius

hotrodmarlin

Posted: Jun 25, 2016 at 15:53	Quote
So 8' tall 12' radius is a good start? If I go 10' tall same radius or go to 14'?

ThePeanutGallery

Posted: Jun 28, 2016 at 5:48	Quote
Look up all CMC4130's post. He always has amazing write ups on this. With diagrams and explanations.

cmc4130

Posted: Jul 15, 2016 at 12:15

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allsk8sno wrote:

Big bike, you will want more like 12' radius

Agree. (at least when you're talking about big launches).

Most beginner builders build ramps too steep. Most ramps are actually mellower than people think. In BMX, the starting point should be radius is double the height. Like 4 foot tall 8 foot radius. Or 5 foot tall, 10 foot radius. Some ramps will go steeper, like 6 foot tall 10 foot radius. But a lot can also go mellower, like where the height is only a third of radius length, like 4 foot tall 12 foot radius--this is where you want more of a "sender."

I like to post this photo to prove that yes, you can still go for tricks on a ramp that is not super steep. This one looks to be about 50 degrees of arc. That's where the height of the ramp is around a third of the radius length; like 5 foot tall 15 foot radius.....

(Greg Tait rider, photo by Octavio).

best radius for 6ft kicker HELP!
https://www.pinkbike.com/forum/listcomments/?threadid=162126

Maxridesmtb13

Posted: Feb 20, 2022 at 14:10	Quote
Wasup guys I’m trying to build a 4ft 5 kicker ramp for a trick jump in my garden as I don’t have the space in my garden for a 7 ft tall one,anyways I want it to have like a small gap like around 3 ft for new tricks like backflip and so on so what should the radius be for the kicker be? Thanks!

Liamgreen2727

Posted: Jul 2, 2022 at 15:37	Quote
I am making a 7 ft tall wooden trick jump in my back yard. It will be used by my dirt jumper and enduro bikes. What radius should it be?

cmc4130

Posted: Oct 4, 2022 at 14:11

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Liamgreen2727 wrote:

I am making a 7 ft tall wooden trick jump in my back yard. It will be used by my dirt jumper and enduro bikes. What radius should it be?

It really depends on how steep you want it to be. 7 feet is pretty tall. I don't know what your backyard is like, but if you're not on a big hill, you're going to need a hell of a roll-in structure.

If the radius is around double the height, then you'll have a transition that is around 60 degrees of arc. Ramps can go a little steeper than that or a little mellower, depending what you want... like the 50 to 70 degree range.

Typical BMX Box Jump for trick demos

Another typical BMX Box Jump (probably around 5'6" tall)

Slopestyle ramps tend to be taller than BMX box jumps, with a larger radius. So instead of like 5' tall and 8' radius, it's more like 7' tall and 12' radius.

Tall roll-in for speed

This jump was designed to send riders far out into the water, but Greg Tait, Austin TX, was still able to go for a double flip off it
.

cmc4130

Posted: Jun 10, 2023 at 6:08

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Chris Wood’s great examples of beginner sender jumps—they teach people to go fast and clear some distance. Long wheelbase, mellow angle lip.

wilderkindagood

Posted: Sep 20, 2023 at 19:33

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*NEED HELP*
so basicaly im building a wooden step up. i have a big run in down a hill, and it transitions into another hill. i dug into the hill to create basicaly a flat bomb whole that goes into the hill. it dosent go down but the trail just stays flat into the hill. i did this beacuse the hill itself is pretty gradual, and im aiming for alot of verticle hight, not leangth in the jump. i was thinking about a 7-8 foot tall lip, that would work well with both free ride bikes, like 180mm travel, and dj bikes. but leaing more twards the big bike, as a full dj lip would be not as comfurtable on the big bike. i was also trying to figure out how high i wanted to go in the air. mabey 10-15 vert hight with a super minimal fall from the vertex to the landing, in order to reduce injury. the landing will also be slighty slanted down to have somewhere for energy to go if i slam.
thanks for the help.

naptime

Posted: Sep 20, 2023 at 21:34	Quote
look into a transition compass, basicaly a huge compass made from two long 2X4's. That's wht we used when I had a job building skate parks.

saber63

Posted: Oct 25, 2025 at 7:49

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Working on building some jumps for bigger bikes, I can read till my eyes cross, but i could really really some perspective!

If we take popular trails at whistler like, crank it up, A-line, and freight train as examples, what are some common jump shapes? Radius, takeoff angle etc?

I measured a side pic of cats meow and got ~30' radius, 5ft straight lip @25deg, 20' lip to landing.... Which seems really mellower then it feels?

Also how to get that same a-line feeling on a DJ/4x or BMX sized bike!

Id love to build the jump style with a mellow and poppy sides but want todo a bit of math so we dont end up on the flat

Thanks!

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