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PostPosted: Sun Nov 13, 2011 7:50 pm 
MacRetro rider
MacRetro rider
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Joined: Fri Mar 09, 2007 2:11 pm
Posts: 8700
Location: DUNDEE
I made a start building the ski bike today, going to be built at minimum cost....

Image

Image

Need to stack up the trucks a bit on the ski's but it is starting to take shape, going to use bmx stunt pegs bolted to the BB axle for foot rests.
Still need to work out how to make the skis swivel freely, thinking a bracket at each side using a bike axle and the disc brake mounts to attach to the frame with the skate truck hanging freely from that. Don't want the block of wood home made look you see on some. Might need a narrower truck for the front but trying to only butcher 1 skate board for now :)


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 Post subject: Well done that man
PostPosted: Sun Nov 13, 2011 8:01 pm 
retrobike rider
retrobike rider
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Joined: Sun Aug 15, 2010 3:32 pm
Posts: 405
Location: London, UK
Well done, keep the momentum going. At least you know that frame will work, I've had something like 8 weeks on the East Peak without issues. Those cut down skis will want to skid and not carve, which isn't too much of an issue when you start and can make for a lot of sideways fun. The skis need to pivot a bit, but not as much as you might think, just make sure the rear is stopped from submarining.
There's a really buzzing FaceBook Group here http://www.facebook.com/groups/6592654004/ if you need some further inspiration.


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 Post subject:
PostPosted: Mon Nov 14, 2011 2:43 am 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider
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Joined: Sun May 25, 2008 11:03 am
Posts: 18207
Location: Sunny Glasgow
You mind and tell us all when its going to be put to the test TK :wink: .I'd love to watch....and probably laugh when you fall off :lol: :lol:

Baggsie a shot :D


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 Post subject:
PostPosted: Mon Nov 14, 2011 10:24 am 
MacRetro rider
MacRetro rider
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Joined: Fri Mar 09, 2007 2:11 pm
Posts: 8700
Location: DUNDEE
what do you mean by submarining purley? I was just going to use thin bushings to allow for swivel on the back but spotted this on the facebook page.... http://www.pinkbike.com/photo/6132843/
This guy doesn't seem to have any swivel at all - I can see on the front that that should be fine because the travel is linear but the back I thought would need to swivel as it will travel in an arc.


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 Post subject:
PostPosted: Mon Nov 14, 2011 10:32 pm 
Gold Trader
Gold Trader
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Joined: Sat Oct 23, 2010 10:33 pm
Posts: 2117
Location: New Forest
Jump frame: Check
Old Manitous: Check
Skis: Arriving on wednesday...


:twisted: :twisted:


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 Post subject: Submarining Explained
PostPosted: Tue Nov 15, 2011 9:39 am 
retrobike rider
retrobike rider
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Joined: Sun Aug 15, 2010 3:32 pm
Posts: 405
Location: London, UK
The Ken, when you ride on soft un-preppared snow, the rear ski will tend to tip down at the front, eventually jacking up the rear suspension and digging in. I call this submarining; it works the same way when you ski off piste and shift your weight back on your feet to compensate.
All that is required is a link from the ski tip to a point on the frame near the bottom bracket. Some DIY builders use a bungee cord, I used some galvanised chain, mainly because I had plenty in stock.


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 Post subject:
PostPosted: Fri Dec 02, 2011 3:50 pm 
MacRetro rider
MacRetro rider
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Joined: Fri Mar 09, 2007 2:11 pm
Posts: 8700
Location: DUNDEE
Rakas has built this...

http://www.retrobike.co.uk/forum/viewto ... 37#1327237

Image

Worth reading about the model pk ripper too if you haven't done so already


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 Post subject:
PostPosted: Fri Dec 02, 2011 5:03 pm 
Dirt Disciple

Joined: Mon Nov 17, 2008 12:04 am
Posts: 61
Location: watford
yep, thats my new toy. It works really well, i basically copied one of these as much as i could.

http://www.youtube.com/watch?v=ZFjYZrYxf2M

I work at hemel snowcentre shaping the freestyle park so ive got free reign to play on my toy as much as i want.


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 Post subject:
PostPosted: Fri Dec 02, 2011 6:57 pm 
Gold Trader / PoTM Winner / RB Rider
Gold Trader / PoTM Winner / RB Rider
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Joined: Wed Oct 05, 2005 7:45 pm
Posts: 10939
Location: kent
that is briliant guys .

could be a nice winter project .


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 Post subject:
PostPosted: Fri Dec 02, 2011 9:18 pm 
MacRetro rider
MacRetro rider
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Joined: Tue Aug 30, 2011 7:33 pm
Posts: 434
Do you need anything fancy to build one of these? Ive got à rigid frame and à pair of old skis that can be cut would just need some skateboard trucks.


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