rm125 springs and rates/trade?

[bclapham]

hi guys:

i am looking for springs for an 02rm125, to suit my 220lbs! :eek:

where is the mx-tech spring rate generator, i couldnt find it on their site.

on race tech, their suggested rates were 0.45 fork and 5.1 shock.

do you think i can get away with running the stock springs from a cr250, i see they are both showas and the crs were 0.44 and 4.9 i think. i am sure i could get some of these at a reasonable price, anyone got any used ones? bclapham@scripps.edu

cheers

bruce

 

[Luft]

I've got the stock 03 forks and shock springs, cheap, if you are interested.

 

[bclapham]

please drop me a line at the above email. i think the rates for the 03 are fork 0.44mmkg and shock 5.1mmkg, can you confirm this? i will double check at service honda anyway

cheers

 

[Luft]

According to the manual:

fork spring
.42 standard
.44 hard

shock spring
4.9 standard
5.2 hard

I'm having trouble with the email at the moment.

 

[marcusgunby]

bruce the mx tech generator is on the home page on the rhs.
I did the number crunching for you
Your stock fork spring rate is.....42kg/mm
Your stock shock spring rate is....4.8kg/mm
Your recommended shock spring rate is....5.08kg/mm
Your recommended fork spring rate is....0.4534kg/mm
Your fork spring series is....43470xx
Your shock spring series is....mxtxx/50

 

[bclapham]

so for the 02-03 cr250, the stock spring rates are.....drum role....

GP racing: 0.44 fork, 5.1 shock

RT 0.43 fork, 4.6 shock

MX-tech 0.45 fork, 4.9 shock

WTF? :silly:

 

[marcusgunby]

Yep thats the problem with these generators.
the mx tech one does honestly seem closer to me than some of the others.
I doubt the cr250 has a 4.6 like RT say.

 

[bclapham]

NO, they are the quoted stock values from the CR

 

[marcusgunby]

Yes i know:)i think the Rt ones are wrong and the mx tech are correct for the claimed std rates.

 

[Jeff Howe]

02 CR250 stock is .43 and 4.9 thats what they are regardless what everybody else says. 01 had .44kg forks and 00 had .43's. I had more then a few 01 shock springs rate as low as 4.5kg. I know that was the case because I recall one coming in with 18mm of preload on it to get a 190lb guy to 100mm of sag and it was topped out hard. Thats a lot of preload!! So watch them stock 01 CR shock springs. I've had no problems like that with the 02's.

 

[marcusgunby]

Isnt it good to be able to find out something as simple as std spring rates;)
it gets even worse on some models as the euro ones have different/progressive springs.Even stranger is the fronts on the YZ250f are stiffer on the euros than the sx derived US version-?????????

 

[bclapham]

do you guys recon 0.43 and 4.9 is too far away from 0.45 and 5.1?

 

[marcusgunby]

I think the showas can cope with a lesser spring rate due to the inner chamber spring.On the shock i think you need to go to at least the 5.1.

 

[bclapham]

i will see if i can get a used rear locally then.

apparently, the rm forks use shorter springs than the cr so they wont work. that said, i am getting ahead of myself, the bike dont even run yet, LOL