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Yo freestylahz! Quarter pipe question

kidwoo

kidwoo

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Aug 25, 2003
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I'm planning on putting a big ass quarter pipe at the end of a dirtjump line. It's a pretty big line with some good speed plus a downhill approach....so I'm thinking like 12ft high....all wood, 2x4 surface. Kind of like that one that existed for a while at whistler.


Now I've never ridden a quarter that big on a bicycle....just half pipes about that size on a skateboard. So my question is this. Do I need vert on it?

I'm thinking no. Mostly because that allows more room for transition and it's really not that hard to suck up a bike, and you're already going to be pretty light by the time you get to the top. But like I said....I've never ridden one like that.

What say yous? Joe: I'm looking in your direction here :D
 
pnj

pnj

Turbo Monkey till the fat lady sings
Aug 14, 2002
4,696
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seattle
If it's so you can turn around on, I'd go to at least vertical.


so 12 feet tall with a 12 foot radious.
 
kidwoo

kidwoo

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pnj said:
If it's so you can turn around on, I'd go to at least vertical.


so 12 feet tall with a 12 foot radious.
Click to expand...
That's exactly what I've got sketched out right now.


I'm thinking that will be fine. Unless someone who's actually got years of experience riding halfpipes or quarters this size tells me otherwise. All I know is skateboards.
 
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kidwoo

kidwoo

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TheTruth said:
If it had vert it would be a vert wall. So I would make it 12 by 12r. I would not want to hit vert at 12 feet in the air. Maybe a 2 feet of steepness at the top but not vert.
Click to expand...
Well it's definitely going to be continuous. I'm not putting a flat spot in it anywhere...... That gets weird and dangerous.


Like I said, the 12 radius right up to vert is what I'm planning on.
 
G

grom-dom

Turbo Monkey
Jun 27, 2006
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Chapel Thrill
it sounds like a majority of you guys don't ride park much. a 12 foot quarter with 12 feet of transition is not a vert wall. a vert wall would be more like a 12 foot quarter with 4 or 5 feet of transition. a 12 foot quarter is also massive. most competition vert ramps are 13 feet or so.

kidwoo, how big is the line you're talking about? that's a major factor in quarter size. also, will it be only mountain bikes riding it? if so, factor in wheel size when cutting transition. a 12 foot quarter with 12 feet of transition may be a little tight. i'd go for 13 or 14 feet of transition if it's 12 feet. just my 2 cents.
 
M

mattt

Monkey
Jul 21, 2009
126
0
texas
Ive ridden lots of parks, most of them have the biggest vert-quarters at 9 ft... An eight foot quarter is way big enough to get rad on a MTB. 12 feet is huge and 14 ft is pretty retarded... Itd be a lot of work and fun but i think eight footers are the most fun/ least scary.
 
A

addomg

Chimp
Apr 29, 2010
9
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texas
I would go with the same radius as height, so 12 for 12. This one is real close to that and feels the same as the one they had in wizzler a few years back. These guys faced it with 1x4's.


 
kidwoo

kidwoo

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grom-dom said:
it sounds like a majority of you guys don't ride park much. a 12 foot quarter with 12 feet of transition is not a vert wall. a vert wall would be more like a 12 foot quarter with 4 or 5 feet of transition. a 12 foot quarter is also massive. most competition vert ramps are 13 feet or so.

kidwoo, how big is the line you're talking about? that's a major factor in quarter size. also, will it be only mountain bikes riding it? if so, factor in wheel size when cutting transition. a 12 foot quarter with 12 feet of transition may be a little tight. i'd go for 13 or 14 feet of transition if it's 12 feet. just my 2 cents.
Click to expand...
The line is freakin huge. Even a 12 quarter won't be big enough but it's about all that can go in the space. A bigger transition might work but I just don't won't to be hanging up when it gets to be boosty time. I'm having a hard time convincing myself that a 12' radius is tight.........
 
G

grom-dom

Turbo Monkey
Jun 27, 2006
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kidwoo said:
The line is freakin huge. Even a 12 quarter won't be big enough but it's about all that can go in the space. A bigger transition might work but I just don't won't to be hanging up when it gets to be boosty time. I'm having a hard time convincing myself that a 12' radius is tight.........
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12 foot quarter is gnarly. i think 13 feet of transition on 12 foot quarter would be good. and make sure not to put the coping too far out/too far back. looking forward to seeing this creation. how wide are you making it?
 
J

joelalamo45

Monkey
Jun 25, 2007
741
1
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Ok, lemme chime in here. The first year of Crankworx Colorado they had a 13' tall, 13' transition quarter... Just got to vert. If you didn't know what you were doing, you'd land really flat because of the suspension kicking you out... I'm gonna go with grom-dom on this one and say 13' transition and 11'-12' tall... Keep it a bit under vert. Last years C-worx Colorado's quarter/bank feature was under vert and I could air the sh!t outta that thing without worrying about landing flat.

Under vert a little...
 
OGRipper

OGRipper

back alley ripper
Feb 3, 2004
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A 12 footer going just to vert sounds good. Especially if you want to be able to air it out at speed rather than just turn around. (With no vert at all you run a bigger risk of hanging up on the coping.)

It's been a long time since I've built ramps but I used to like 10 foot quarters with about 4-5" of vert for 20". That was way BITD though.

If you are landing flat on a 12 foot QP you are doing it wrong. That's a pretty big transition to miss.
 
cmc

cmc

Turbo Monkey
Nov 17, 2006
2,052
6
austin
kidwoo said:
I'm planning on putting a big ass quarter pipe at the end of a dirtjump line. It's a pretty big line with some good speed plus a downhill approach....so I'm thinking like 12ft high....all wood, 2x4 surface. Kind of like that one that existed for a while at whistler.

. . . .
Click to expand...
Seems like there are two questions
(1) exactly how fast will riders be going at the end of the dirt jump line ?
(2) do you want riders to be able to blast big over-coping airs, or are you just wanting something to soak up all that speed coming down the hill ?



btw, is this the ramp you were talking about?

 
kidwoo

kidwoo

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cmc said:
Seems like there are two questions
(1) exactly how fast will riders be going at the end of the dirt jump line ?
(2) do you want riders to be able to blast big over-coping airs, or are you just wanting something to soak up all that speed coming down the hill ?
Click to expand...

1) very fast, fast enough that airing out a 12 quarter a few feet above the lip won't be a problem if you want to

2) those two aren't mutually exclusive. This will serve both purposes.


And yeah that's the one at whistler I was thinking of. This will be bigger though. I was thinking of that one mainly in terms of construction. Hard to tell with that angle but it looks like that one goes nowhere near vert.
 
OGRipper

OGRipper

back alley ripper
Feb 3, 2004
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NORCAL is the hizzle
kidwoo said:
I was thinking of that one mainly in terms of construction.
Click to expand...
I remember riding that thing and thinking it was a pretty funky way to build a QP, at least the 2x4's on the surface anyway. A more typical approach is to cut your radius out of thick plywood (like 3/4"), use 2x4's or 2x6's as cross braces - oriented with the 2 inch side facing the surface - and then cover with multiple layers of thin plywood (I think we used to use 1/4" or 3/8"). Think about how much a 2x4 flexes if you walk on the 4" side vs. the 2" side and you'll see why.

On a side note, I rode a DH bike again last weekend for the first time since I broke my wrist - not 100% but I'll see you at the * soon enough.
 
kidwoo

kidwoo

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That's how I used to build vert and miniramps. That won't be happening here though. No plywood. I'm using 2x12s for the tranny radius. This thing will definitely have a lumber surface. It needs to be burly and durable. The transition radius should be big enough that it should be smooth.....especially for something the size of a bike wheel.
 
J

joelalamo45

Monkey
Jun 25, 2007
741
1
Idaho Springs, Colorado
The only reason I say build it a bit under vert is because (I may be wrong) but this thing will be ridden by bikes with suspension. The suspension at the top tends to extend and push you out a bit. I say this with quite a bit of experience riding a 13' vert quarter on a mtb, and an under vert quarter and an mtb... I preferred the under vert. See that under vert one I posted? 6' easy out of the top of that thing and never came close to hanging up.
 
sittingduck

sittingduck

Turbo Monkey
Jun 22, 2007
1,958
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Oregon
Here's a sketch, both 12 and 13 foot transitions, both 12' tall.
Click on the image for a bigger, clearer view....
 
cmc

cmc

Turbo Monkey
Nov 17, 2006
2,052
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austin
kidwoo said:
1) very fast, fast enough that airing out a 12 quarter a few feet above the lip won't be a problem if you want to
. . . .
Click to expand...
it would be interesting to know exactly how fast dave mirra, hoffman, bestwick etc. are going across the flatbottom of a competition vert ramp when they are hitting airs in the 10 foot range. surely, someone somewhere has clocked it?? maybe it could be clocked just with a video camera's internal timer.....
 
J

joelalamo45

Monkey
Jun 25, 2007
741
1
Idaho Springs, Colorado
cmc said:
it would be interesting to know exactly how fast dave mirra, hoffman, bestwick etc. are going across the flatbottom of a competition vert ramp when they are hitting airs in the 10 foot range. surely, someone somewhere has clocked it?? maybe it could be clocked just with a video camera's internal timer.....
Click to expand...
I can tell you from experience, it's a lot faster than you'd be going at a MONSTER dj line
 
S

Savage_Animal

Monkey
Feb 3, 2008
658
0
Norcal
If you remember the thread I had a while ago I made something similar with 2x4's, its after a jump in my yard, this is 6 feet high and 8 foot radius. It turned out really good, definitely super fun to ride.




I say just do a 10 foot radius and then once it reaches vert just keep going up.
 
kidwoo

kidwoo

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joelalamo45 said:
I can tell you from experience, it's a lot faster than you'd be going at a MONSTER dj line
Click to expand...
*sigh*


the last landing is 12 feet high


then it's downhill into where I want to build this quarter


On average, people are about 5 feet above above that landing

then add in about another 4-6 feet elevation loss










give me some credit will ya? ;)


this ain't your average dirtjump line
 
kidwoo

kidwoo

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joelalamo45 said:
Ok, credit due! However, an X-Games ramp is 14' tall, metal, skatelight and vert for days so we'll call it even, bro :) (you actually have me beat on this one so F me)!!
Click to expand...
I rode one of those 'competition sized' ramps a few years ago on a skateboard. (That's what they called them when the standard went from like 11' to 13-14)

It was friggin weird. You had to be mobbing just to even pump the transitions.


I appreciate your help man....seriously. Like I said, I have no idea what it's like to hit a ramp like that on a bike. I hope to find out soon though :D
 
motomike

motomike

Turbo Monkey
Jan 19, 2005
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North Carolina
I hope they are paying you to build those trails, because you do killer work. Saw it last fall, that's such a perfect spot for a massive 1/4. It may be because I'm a shorty, but that last lander looks a hell of a lot taller than 12 feet!
 
aaronrocker

aaronrocker

Monkey
Aug 7, 2008
477
0
Washington State
my favorite vert wall was at at the end of a set of doubles at a local skate park, the vert wall was as tall as the warehouse that the skatepark was set at, i used to love slapping the roof at the end, so fvcking awsome
 
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