Hi
Can anyone tell me what is the length of the standard forks, from the centre of the axle to the top edge of the fork cap.
Looking for this measurement in 3 forms:
totally unweighted, with weight of bike alone, and a general idea of what it should be with bike + rider (when correctly set up).
Thanks !
(10-03-19, 12:13 PM)ArchDruid link Wrote: what is the length of the standard forks, from the centre of the axle to the top edge of the fork cap.
It's about 810mm, and unfortunately I also have uprated springs in mine.
Most importantly, they have 140mm of travel. With the rider on board, you're roughly looking for between one quarter to one third of travel being used up. One quarter of travel (35mm) will feel firm-ish, one third of travel (46mm) will feel soft. You could go even firmer (down to 30mm) but wouldn't go softer than 46mm.
I put a block of wood under the exhaust pipes, jack it up and then measure the length of exposed stanchion from underside of yoke down to the fork seal. Then off the block & measure again.
(10-03-19, 07:37 PM)kebab19 link Wrote: [quote author=ArchDruid link=topic=25032.msg294289#msg294289 date=1552216432]
what is the length of the standard forks, from the centre of the axle to the top edge of the fork cap.
It's about 810mm, and unfortunately I also have uprated springs in mine.
Most importantly, they have 140mm of travel. With the rider on board, you're roughly looking for between one quarter to one third of travel being used up. One quarter of travel (35mm) will feel firm-ish, one third of travel (46mm) will feel soft. You could go even firmer (down to 30mm) but wouldn't go softer than 46mm.
I put a block of wood under the exhaust pipes, jack it up and then measure the length of exposed stanchion from underside of yoke down to the fork seal. Then off the block & measure again.
[/quote] good info feller, I didn't know any of that :thumbup
You guys mention uprated springs....
As with the fork lengths queried above, I cant seem to find any info in the Haynes manual on the standard spring rates (only the spring free length is given, 344mm)
So... any info on the std spring rates, and more importantly, what did you put in instead ?
(10-03-19, 11:07 PM)ArchDruid link Wrote: You guys mention uprated springs....
As with the fork lengths queried above, I cant seem to find any info in the Haynes manual on the standard spring rates (only the spring free length is given, 344mm)
So... any info on the std spring rates, and more importantly, what did you put in instead ?
It’s in the manual they are dual rate springs. Too soft and then too hard, but I can’t remember the numbers.
(10-03-19, 11:07 PM)ArchDruid link Wrote: You guys mention uprated springs....
As with the fork lengths queried above, I cant seem to find any info in the Haynes manual on the standard spring rates (only the spring free length is given, 344mm)
So... any info on the std spring rates, and more importantly, what did you put in instead ?
Regarding the non standard springs various members have installed, in most cases they'd have taken advice from their chosen suspension guy, concentrating on weight and use. With that info they can advise on the most suitable spring and what oil weight.If you always ride solo, then linears would be the way to go, whereas progressives would suit more general use to encompass pillions, touring luggage etc. I've not used MCT, but members who have seem more than satisfied. I think their main advantage is that they're a road based specialist that's migrated into racing. I'll certainly be taking advise from them when finances allow.
Whizz kid sitting pretty on his two wheeled stallion.
(10-03-19, 11:07 PM)ArchDruid link Wrote: So... any info on the std spring rates, and more importantly, what did you put in instead ?
The standard springs are dual rate, and both rates combined just feel wrong - the spring length proportions are out of sync IMO. The softer rate is 0.83kg/mm and the firmer rate is 1.2kg/mm.
I originally went with linear 0.95kg/mm K-Tech springs but found that they were way too firm for me (rider around 12 stone, 13 in gear). As I was also unhappy with the average damping, I swapped them for 0.85kg/mm springs but also added Racetech Compression & Rebound dampers. Racetech also recommend a smaller air gap / more fork oil than standard, which firms things up.If I'd stuck with standard valving and oil, 0.90kg/mm springs might have been best for me, but everyone is different - some people love a compliant, squishy suspension setup and others don't...
:thumbup
