VFRDiscussion ARCHIVE / READ-ONLYREAD-ONLY

Spring rate help

7 posts Started 15 May 2012 Last recovered post 6 Jun 2012 Wayback Machine snapshot 5 Jul 2012

#1
Ok, I've read all the threads in the maintenance section, heck pretty much the entire site about spring rates.  Mostly what I found out is that everybody's calculator is off for the VFR (unless it's your calculator) everybody's 'expert' is an idiot (unless he's your expert) and that most people that say "I use x spring rate in front and y rate in the rear and love it" seem to leave out some useful bit of info, such as their weight, their shock, whether or not they have bags, where they got the spring, why they chose it, static sag vs rider sag, and most important what generation the bike is.  I'd like to get some 5th gen specific spring rates, with the following info:
Weight of rider
Bags, y/n
Spring rate front
Spring rate rear
Static sag
Rider sag

It'd also be mighty nice if the same measurement was used for all rates, rather than 1050lbs in one post then 475kg the next.
Please?
#2
Email Jamie D. with your questions. I got a rear shock from him last year and it was sprung perfectly.

-Jake
#3
The RaceTech site has a spring rate calculator which asks your weight and track/street use. It does not ask about pillion / luggage load. It quotes the standard OE rates for comparison.
The site has a sag setting routine explained too, with IIRC recommendations for measurements.
It works in either Imperial or Metric units as you select.
See here:- http://racetech.com/...FR800/1998-2001
HTH
#4
It seems that two most used for suspension work on both forums, VFRD and VFRW, are Jamie Daugherty and Race Tech. Although Race Tech is closer to were I live, I went with Jamie as I have not heard/seen one gripe about his work. Pricing was well within my budget too.http://www.daughertymotorsports.com

Just waiting for the gear to be sent back so I can install it. Once I do I'll definitely post up my thoughts.

Cheers.
#5
I have contacted Jamie, but I still would like to see this thread populated with data for future use.  I'll definitely be adding my info once he responds and I get the new springs in.  I also bought a 929 shock off ebay for next to nothing, so I'll have that going on as well.
#6
Though I am unsure of the spring rate on the front of the bike as the front forks were redone and RaceTech springs installed by the previous owner, I have a CBR929 shock from Daugherty Motorsports with an 1100lb spring.  The spring might seem a bit heavy but I usually ride two up with my wife.  I am 175lb and my wife is 125lb. The rider sag was set with just my own weight (175lbs) and is 32mm front and rear.  I usually adjust the preload about two clicks when my wife is on the bike and then back it off again when I use the bike for commuting to work.  Off the top of my head, I can not remember what the static sag was.   Man what a difference the shock Jamie Daugherty did up for me has made in regards to the handling.  The bike feels far more planted and feels quicker to respond.  My wife also commented that the rear suspension does not feel anywhere near as spongy as it used to be with the stock shock.  Hope this information is helpful.
#7
Sportrider mag recommended about 30mm static sag f&r. Ohlins recommends 15-30mm/10-20mm f&r static. 35-50mm/25-40mm f&r sag with rider.

To get in that ballpark I needed a 1085 spring on my Ohlins shock, I'm 205lbs w/out gear. I do run with a bag most of the time but lightly loaded.

Bailyrock has some strong opinions on this subject and I agree with him. I think figuring out your sag is first then dialing in which spring rate is best for your unique situation.
End of thread · 7 posts recovered Wayback Machine snapshot 5 Jul 2012