Shortening front forks.
in [Tech]
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From: Greg.Procter on 22 Oct 2009 23:09 On Fri, 23 Oct 2009 15:36:43 +1300, little man upon the stair <macmiled(a)gmail.com> wrote: > On Oct 22, 7:22�pm, "Greg.Procter" <proc...(a)ihug.co.nz> wrote: > >> Adapting "X" axle and wheel to "Y" forks is no problem. >> I could equally design completely new forks and machine them, >> but if existing forks could be shortened it would cut costs drastically. > > You'd have to adapt a smaller diameter scooter wheel (maybe a 12~14 > incher) to any motorcycle fork that you might find. > > The typical small motorcycle front wheel just wouldn't fit under the > front "fender" of an NZeta... > "fender"? is that like "mudguard" or "front bumper"? The dividing line is the chrome strip - petrol tank above, metal below is frame. (well, upright sheet metal, rolled bottom edge, "L" top edge) There's 6"/150mm of wheel travel and still several inches of extra space.
From: paul c on 23 Oct 2009 10:37 Greg.Procter wrote: > On Fri, 23 Oct 2009 15:36:43 +1300, little man upon the stair > <macmiled(a)gmail.com> wrote: > >> On Oct 22, 7:22 pm, "Greg.Procter" <proc...(a)ihug.co.nz> wrote: >> >>> Adapting "X" axle and wheel to "Y" forks is no problem. >>> I could equally design completely new forks and machine them, >>> but if existing forks could be shortened it would cut costs drastically. >> >> You'd have to adapt a smaller diameter scooter wheel (maybe a 12~14 >> incher) to any motorcycle fork that you might find. >> >> The typical small motorcycle front wheel just wouldn't fit under the >> front "fender" of an NZeta... >> >> http://en.wikipedia.org/wiki/%C4%8Cezeta >> > > The original wheel is sufficient - 12" and there's just room for > two yokes below the head. Machining up yokes is not a problem > and gives me the chance to increase the trail. (curreently 75mm/3") > Modifying other forks would make fitting a disk brake easy. > > Didn't think of Wikipaedia, must have a look! (Thanks for the marque name, interesting photos here and there on the web. I've never seen a Cezeta/Nzeta in person but it reminds of a number of Euro scoots from that era.) I was wondering if you'd have to change rake and therefore trail, maybe better high-speed stability is what you have in mind but personally I wouldn't want to change the low-speed behaviour. If the main goal is stronger braking, an alternative might be to consider beefing up the stock forks to mount a disc and caliper, maybe similar to the way the leading-link Ural models do it, plus possibly heavier shock and spring since they probably need replacement anyway.
From: little man upon the stair on 23 Oct 2009 14:24 On Oct 23, 7:37 am, paul c <toledobythe...(a)oohay.ac> wrote: > I was wondering if you'd have to change > rake and therefore trail, maybe better high-speed stability is what you > have in mind but personally I wouldn't want to change the low-speed > behaviour. It's not a good idea to try going faster than about 50 mph on a scooter with moderate sized wheels, because the diameter of the tire not only affects handling, it affects ride quality and traction as the tire rolls over tiny bumps in the pavement. Some of the larger scooters have gone to 18-inch wheels to manage the bump problem.
From: The Older Gentleman on 23 Oct 2009 14:31 little man upon the stair <macmiled(a)gmail.com> wrote: > On Oct 23, 7:37 am, paul c <toledobythe...(a)oohay.ac> wrote: > > > I was wondering if you'd have to change > > rake and therefore trail, maybe better high-speed stability is what you > > have in mind but personally I wouldn't want to change the low-speed > > behaviour. > > It's not a good idea to try going faster than about 50 mph on a > scooter with moderate sized wheels, because the diameter of the tire > not only affects handling, it affects ride quality and traction as the > tire rolls over tiny bumps in the pavement. More nonsense. Ever ridden any of the new generation of super-scoots? No, thought not. I rode a 400 Burgman a couple of years ago. Opened my mind. Damn thing did over 90 and handled really well. And if you think about it (which you don't) your complaint would apply to every single bike with (say) wheels of 16" or less, not just scooters. > > Some of the larger scooters have gone to 18-inch wheels to manage the > bump problem. And some go just fine on smaller ones. And in any case, the real problem with smaller wheels is the twitchiness of them. You know nothing. -- BMW K1100LT Ducati 750SS Honda CB400F Triumph Street Triple Suzuki TS250ER (currently Beaving) Damn, back to five bikes! Try Googling before asking a damn silly question. chateau dot murray at idnet dot com
From: little man upon the stair on 23 Oct 2009 15:18
On Oct 23, 11:31 am, totallydeadmail...(a)yahoo.co.uk (The Evil Clown) wrote: > You know nothing. You prove that you know less every time you challenge an obvious fact. |