Parallelogram Forks Are Back...

Postby Trail on Tue 3/Nov/15 12:00pm

I have heard a few people discussing parallelogram forks in the last year... and here is a company that have got a model - pretty ugly, but just might work!

http://singletrackworld.com/2015/11/mot ... gram-fork/
Trail
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Re: Parallelogram Forks Are Back...

Postby Dougal on Tue 3/Nov/15 8:22pm

Interesting design, looks like really strong anti-dive at full extension but it's hard to see how it would all sit at intended sag.

Damper in the head-tube would limit stroke to more XC type length.
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Re: Parallelogram Forks Are Back...

Postby Velocipedestrian on Tue 3/Nov/15 9:56pm

Na, you just can't cut the steerer coz it's full of clever.
80mm of spacers on top of your stem.
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Re: Parallelogram Forks Are Back...

Postby Sims on Tue 3/Nov/15 10:00pm

Its different to what I know. I don't like it.
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Re: Parallelogram Forks Are Back...

Postby Astoria Paranoia on Tue 3/Nov/15 10:10pm

How do you put a Marsh Guard on it?
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Re: Parallelogram Forks Are Back...

Postby Sims on Tue 3/Nov/15 10:27pm

How do you put your cock on it?
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Re: Parallelogram Forks Are Back...

Postby Trail on Wed 4/Nov/15 9:03am

Dougal wrote:Interesting design, looks like really strong anti-dive at full extension but it's hard to see how it would all sit at intended sag.

Damper in the head-tube would limit stroke to more XC type length.


In the video it looked like there was an external damper?
Trail
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Re: Parallelogram Forks Are Back...

Postby mfw on Wed 4/Nov/15 9:52am

All previous anti dive designs for motorbikes have failed to take off, for road bikes the dive during braking has a net benefit:
> rake increase > trail decrease > less stability > turn in speed increased (against gyroscopic forces)
This seems to outweigh the disadvantage of suspension packdown.

Dunno if some of this applies to bicycles because the gyroscopic forces are much less.
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Re: Parallelogram Forks Are Back...

Postby foremannz on Thu 5/Nov/15 6:47pm

One big thing for myself and another AMP lover was the rate in which the bushings wore out, then the forks got loose very fast - doesn't look like they've done anything to resolve this.
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Re: Parallelogram Forks Are Back...

Postby Rik on Fri 6/Nov/15 10:20am

I would be fascinated to find out how these thing feel compared to conventional forks, especially on the brakes.
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Re: Parallelogram Forks Are Back...

Postby Trail on Fri 6/Nov/15 10:45am

Rik wrote:I would be fascinated to find out how these thing feel compared to conventional forks, especially on the brakes.


Me too.

I have heard Rob Metz (Zerode) talking about building his own linkage driven fork in Rotorua. I think he was talking just one leg instead of two. That would be interesting as well!
Trail
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