Post Your Pumptrack! + Discussion

PB Forum :: Trail Building
Post Your Pumptrack! + Discussion
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Posted: Apr 7, 2016 at 6:04 Quote
steveperry wrote:
Any tips. Just starting to design mine. Thanks

If you look at previous pages you will find lots of suggestions, but I will give a quick summary of what I found to work.

When I built a pumptrack 4.5 years ago, I used a radius of 175 inches (~14.6ft or ~4.45m) and found that to be good for low speeds (I think it was 15-20 km/h). As for pumps, I spaced them ~110 inches from one another (~9.2 ft or ~2.8m), and found that to complement the berms well.

Posted: Apr 7, 2016 at 12:15 Quote
Step 1: Build
Step 2: Ride
Step 3: Post Photos
Repeat

Posted: May 4, 2016 at 4:32 Quote
Here's my pumptrack!

It's in the very early stages. I need more dirt! Luckily (or not) we had to dig a trench for a soakage pit, so now have loads to play with once I finish plumbing that up.

I'm thinking I'll put a layer of road base over the lot once I'm happy with it and then borrow a "whacker" to compact it and make it a bit more all-weather. I was going to bury those rocks as fill but I might use them on the sides of the rollers to hold the dirt up a bit. My two sons destroy the sides pretty quick otherwise!

Any suggestions or comments? The land is on a slight slope so there are uphill sections in either direction. I need to get more rollers in along the straight side to tell if ill be able to pump up it. The berms through the three corners together will have to be way bigger to pump uphill but at least we should be able to carry loads of speed down the straight Smile












Posted: Jun 3, 2016 at 7:04 Quote
Finally... the track is finished. This forum is my favourite reference during planning and building this track.

Check this out:

https://youtu.be/CbeGTns8UUs

Posted: Jun 3, 2016 at 11:03 Quote
ignazditto wrote:
Finally... the track is finished. This forum is my favourite reference during planning and building this track.

Check this out:

https://youtu.be/CbeGTns8UUs

Wow, you used concrete!? Can you talk about that? Did you have to use a wire mesh?

Posted: Jun 3, 2016 at 13:26 Quote
cmc4130 wrote:
Wow, you used concrete!? Can you talk about that? Did you have to use a wire mesh?

Previously I wanted to use a wire mesh, but then the cost is overbudget. So I decided to use the red brick.

At the same time, my office (where the pump track is situated) is doing the restoration of the building, so I used the debris from the old building as the bottom layer of the pump track, it cuts the cost also Smile .

So the material I used: debris, mixed sand and gravel (stamped), red brick, more sand to fill the slit between the brick (and a lot of water) and concrete for the top layer.

I would like to thank you cmc4130, your post help me a lot during the process... awesome!

You can see the picture here: https://www.instagram.com/p/BGNIa3tP0nf/
https://www.instagram.com/p/BGNL7kGP0hT/
https://www.instagram.com/p/BGNMHvpP0hv/

Posted: Jun 6, 2016 at 10:14 Quote
ignazditto wrote:
...the material I used: debris, mixed sand and gravel (stamped), red brick, more sand to fill the slit between the brick (and a lot of water) and concrete for the top layer.

Great technique, and I'm sure the plywood forms helped a lot.


Posted: Jun 6, 2016 at 15:55 Quote
KingsgateDirtJumper wrote:

Great technique, and I'm sure the plywood forms helped a lot.


Indeed.. faster, less rework.

Posted: Jun 7, 2016 at 23:24 Quote
Local park pump track that I have taken over design and maintenance on. Video of old track, which absolutely sucked with zero flow and about as flat and pointless as you can get.

https://www.youtube.com/watch?v=--TjAVn0YJg The pump track is the first 20 seconds of that video, rider is not me.


Has taken me by myself about 250 hours of manual labor using a wheelbarrow, pickaxe, shovel, etc with no machines to build up the track to where it sits right now. So far I've been working on it about 3-4 months, and it's been a hell of a lot of hours in a short amount of time, but gotta dig before it gets 95-100 degrees out. Other people have briefly helped me for a day or two, but about 90 percent of the effort it's been solo.

Have a good loop right now, but want to make 3 loops total as I was able to get 150 cubic yards of dirt delivered to the trail system for free from the park, they were putting in a boat launch area and needed to get rid of dirt so I said I'd love to take it. I estimate I've used about 1/3 to 1/2 of that dirt so far. Thankfully the dirt is pretty much pure red clay which means it's awesome for pump tracks, but doesn't drain great and I had to drain everything with dedicated pipes and gravel, which I had to lug up about 1/2 a mile in a wheelbarrow, that was fun day moving 9 full wheelbarrow loads of gravel 1/2 a mile.









BEFORE


AFTER






Made a model sketch of the pump track as it currently sits. Have everything except the first red part which is going to be a starting ramp about 3-4 feet off the ground into a roller, then start the track. Also have yet to include a dedicated exit line, but that should be fairly easy.

Pump track Crabtree front view
  Pump track Crabtree front view

Pump track Crabtree side view
  Pump track Crabtree side view

Pump track Crabtree different view
  Pump track Crabtree different view

Fatwheels

Posted: Jun 7, 2016 at 23:46 Quote
First month of working on the pump track, had to move several of the berms and adjust rollers a bunch to get it to look and flow right. Still rode very slow, but did get faster as we added stuff evident in the second video.

Views: 231    Faves: 0    Comments: 0


Second month of working on the pump track, starting to get the berms dialed in more. Rollers especially at the beginning needed to be reshaped in order to be more pump-able and faster.

Views: 357    Faves: 1    Comments: 0



Fatwheels

Posted: Jul 13, 2016 at 2:04 Quote
how big do you guys think this pumptrack is? https://www.pinkbike.com/news/crc-mini-pump-track-at-sea-otter-classic-2014.html

Posted: Jul 13, 2016 at 8:20 Quote
rifu wrote:
how big do you guys think this pumptrack is? https://www.pinkbike.com/news/crc-mini-pump-track-at-sea-otter-classic-2014.html

I would guess it's around 50 feet long . . . . You can estimate 8'-12' feet peak to peak between rollers, let's say an average of 9 feet for many pump tracks.

from leelikesbikes.com:
Unsecure image, only https images allowed: http://www.leelikesbikes.com/wp-content/082106ebooklayouts.jpg

Posted: May 23, 2018 at 19:39 Quote

Hey guys i am working with a few local community groups, on putting in a tar-sealed pumptrack.
Any suggestions Would be appriciated

this is what i have so far.

the area has a hill built around a walking bridge stay, so i thought it would be neat to go around the hill. (keep it original)

rollers are around the 2.5 meter d.

Posted: Jun 8, 2018 at 11:06 Quote
hey guys, had a lot of time on my hand today so did some sketchup design..

back yard pump track plan

I am planning to build a super small backyard pumptrack (inspired by this). My backyard is only around 9.8 m long and 5.5 m wide, so yeah there won't be much feature. Only got space for two 180 berms, each with two rollers going in and out of the berm, and a trough inbetween facing rollers. The size of the pumptrack in this design is 8 m long and 4 m wide (measured from the top edge of ridable area). Berm radius is 2 m. Rollers' crest-to-crest distance is 4 m. I don't include any backside and supporting pyramide-shape dirt on the outside because there are concrete walls on three sides and a porch with concrete foundation on one side.

The design is modified from this model, I took it apart and left only an 180 berms as the basic for my design. The outside line between the rollers is based on cmc's speedy roller design. The trough is gonna be deeper on the inside line so that it will be easier to pump at slow speed. Once you pick up speed on the inside line, switch to the outside line, and (hopefully) it will be much more easier to keep the flow on it. I also pick some inspiration from Redbull Mini Drome course (the inside line is always lower than the outside line). It also acts as a way to drain water to the inside (drainage hole is at center).

what do you guys think? will it work?

Posted: Jun 24, 2018 at 3:07 Quote
Getting close to the final layout of my small backyard set up. After the lines are dialed I plan on filling the voids with some #2 river stone I have laying around. Super fun as of now, I have one more idea to add a little bit of variety on the backside, hopefully get that squared away this week.

Almost finished testing tweaking the new layout.


 
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