All this talk of forks .....

Mechanical issues and How-to articles.

Moderators: DAVID THOMPSON, phlat65

All this talk of forks .....

Postby Garf » Wed Feb 20, 2008 8:56 am

As there has been a lot of talk about replacement forks of late (YZF USD being the topic of choice at the moment) I got to thinking about theoretical possibility of using a road based set up from one of the current crop of superbikes (rather than adapting an off road set up) to make a more focussed street bike.

For example, I believe that early Fireblades and some R6's ran 45mm RWU forks so would bolt straight into the existing yokes (spacers etc would need working out for the existing wheel and brake). Alternatively perhaps a complete triple tree, fork, wheel and brake set up could be persuaded to fit ? Alloy wheels and twin discs would certainly make the baggy look 'different' and no doubt help in the braking department.

Certain problems imediately spring to mind:

1) The forks are probably 4 to 6" shorter than those used on a Baggy so would need to be lengthened. Is this feasable ?.....I have had forks shortened so know that isnt a problem but as for fitting longer stanchions I have no idea.

2) The Baggy has a leading axle whereas pure street bikes tend to have the axle directly at the bottom of the fork. If problem 1 was fixed and such forks were fitted this would alter the steering geometry (reduce trail ????) but would be enough to just speed up the turn in etc or would it be too much and make the bike very unstable.

3) Street bike suspension tends to have much less travel than off road derived suspension so would the rear shock travel also need to be altered to 'balance' with the forks ?

4) Getting the matching rear hoop to fit could be difficult with regard to chain clearance. Having said that I think that the supersports 400's ran the same rim / tyre size options as fitted to the Baggy and Stiffy SM's.

Personally, though I currently lack the engineering skill to pull it off, I love the concept of a mad Baggy with a twin disc, USD fork and alloy wheels .........

Perhaps I should just buy a good novel to read in my lunchtimes !! :D
HR Black Panther
Garf
 
Posts: 131
Joined: Wed Jul 06, 2005 4:19 am
Location: Manchester, UK.

Re: All this talk of forks .....

Postby DAVID THOMPSON » Wed Feb 20, 2008 12:28 pm

i would love to find something to fit my old 53 bmw frame as the fork on it is trash
and new parts are all almost always NLA

so a regular fork with a 19 inch wheel and disk would be wonderful
so what if it does not look right all my bikes are daily drivers....any way
dave
Dave 2002 MZ RT125+1995 Saxon Tour(500cc)
1997 MZ 660 Traveller+6/13/09 WV USA
"IN the end times the IDIOTS will be in charge
of everything"
"I like the road less traveled if it's PAVED!"
wd8cyv at yahoo dot com
User avatar
DAVID THOMPSON
Moderator
 
Posts: 5162
Joined: Sun Nov 23, 2003 11:01 am
Location: Parkersburg, West Virginia USA .questions answered MZ 95 up, BMW 1953 to 1979 and ham radio WD8CYV


Return to Mechanic/Tech Talk

Who is online

Users browsing this forum: No registered users and 235 guests