Moto-Dynamix New Zealand-built bike

[GSVR]

Really great that Moto-Dynamix is doing this and I look forward to seeing more about this bike as the information is released.

All this talk of centre hub steering and non conventional front ends reminded me of a photo I took years ago at a Motorshow in Sydney. The race bike in the background gives away around what year it was. Take note that this was only a concept bike but some of the styling seems to have made its way onto some later Suzuki models.

Only one production motorcycle has ever used a swingarm front end according to here:
http://en.wikipedia.org/wiki/Suspension_(motorcycle)

Good explaination of the difference between DuoLever and Telelever suspension too. Reference to the Britten.

[Sanx]

Only one production motorcycle has ever used a swingarm front end according to here:
http://en.wikipedia.org/wiki/Suspension_(motorcycle)

Robert Taylor would have a field day with that article.

[boomer]

The race bike in the background gives away around what year it was.

One of Barry Sheenes' RG500's from '76/77 !?

[Cache Wraith]

I am working on a new! New Zealand built bike at the moment

you're the man!

Can't wait for the photos!

[GSVR]

One of Barry Sheenes' RG500's from '76/77 !?

I actually thought it was a late 80's early 90's GSXR.

[onearmedbandit]

Yeah looks like a GSXR750'R' K model.

[DEATH_INC.]

so there is no linkage or linkage type system?? just a spring and a damper? or is the damper mounted else wear?

No linkage, the shock is the same as a rear....

Isn't it pretty much the same as the britten? Cept that had 2 shocks for the front wheras this just has one?

No, pretty sure the britten used a hossak type front end (could be wrong about that though...)


Sorry for stealin ya thread Shaun....

[Pixie]

Sounds very similar to BMW's telelever system, which is a marvellous looking piece of kit that I must try one day. Much of the benefits of hub-centre steering (no fork dive under braking, fer'instance) without some of the issues that plague it (vagueness in steering due to complicated steering linkages that wear quickly).

The Hossack/Fior (marketed as Duolever by BMW) separates completely the suspension from steering forces. It was developed by Norman Hossack though used by Claude Fior and John Britten on racebikes. Hossack himself described the system as a 'steered upright'. In 2003 BMW announced the K1200S with a new front suspension that is based upon this design.

....credit where credit's due

http://www.hossack-design.co.uk/php/page.php?p=1

[FruitLooPs]

Soo i'm dredging this up, I was curious about the Motoczysz front forks design which by all accounts was quite a sexy bit of kit.

Then I search here and find a kiwi bike offering in the making using what sounds like a similar setup, cmon Shaun months have passed I wants pictures!

Whats the deal with these crazy forks on that motoczysz anyhow, flexing and what not sounds mighty unconventional to me (granted I have NFI about these things). Robert Taylor, what say you, is this the future direction of front suspenders?

[Shaun]

Soo i'm dredging this up, I was curious about the Motoczysz front forks design which by all accounts was quite a sexy bit of kit.

Then I search here and find a kiwi bike offering in the making using what sounds like a similar setup, cmon Shaun months have passed I wants pictures!

Whats the deal with these crazy forks on that motoczysz anyhow, flexing and what not sounds mighty unconventional to me (granted I have NFI about these things). Robert Taylor, what say you, is this the future direction of front suspenders?

Just noticed this, sorry for slow response. The whole Moto-Dynamix programme has been changed, ACC will not let me go back to full time work as yet ( Months away they say) So the Moto-Dynamix NZ bike, is on HOLD, untill I can do full time management etc

[Robert Taylor]

Soo i'm dredging this up, I was curious about the Motoczysz front forks design which by all accounts was quite a sexy bit of kit.

Then I search here and find a kiwi bike offering in the making using what sounds like a similar setup, cmon Shaun months have passed I wants pictures!

Whats the deal with these crazy forks on that motoczysz anyhow, flexing and what not sounds mighty unconventional to me (granted I have NFI about these things). Robert Taylor, what say you, is this the future direction of front suspenders?

Well...people have been writing off telescopic forks for decades. In the ultimate testbed of suspension many radical designs have come and gone but have offered no night and day improvement. Maybe there is too much conservatism, who knows....

[Mental Trousers]

Whats the deal with these crazy forks on that motoczysz anyhow, flexing and what not sounds mighty unconventional to me (granted I have NFI about these things). Robert Taylor, what say you, is this the future direction of front suspenders?

The Motoczysz front end still has forks but instead of the springs and damping being inside the forks it's all done with a shock (very similar to rear shock in a monoshock chassis) mounted between the forks. It uses roller bearings inside the forks and the whole assembly is very rigid with very low stiction.

The problem with that sort of system is that there is virtually no feel - the rider can't tell what's happening when he braking etc. Flex = feel. So they design in flex. Because they design in the flex they have total control over how much feedback the rider gets etc.

One of the main reasons for how great the front end feels is actually the engine. With the vast majority of bikes around the crankshaft lies across the bike. The MotoCzysz has the crankshaft running along the bikes centre line. That's not the unusual part though. The engine is split in 2 with each crankshaft rotating in a different direction. This has the effect of cancelling out any affect the engine has on the chassis.

In most bikes, when you throttle off a part of what makes the bike dip at the front is the torque reaction of the engine slowing. That's just 1 of the effects the engine has on the bike. Also, torque reactions are happening thousands of times a second (eg each power pulse from the engine) so putting that lot into the suspension isn't helpful. Remove those and you've removed a very annoying force that people don't notice until they're not there, freeing the suspension to deal with what it's meant to.