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Correct Spring Rates Excel Sheet

Started by Hubchap, February 20, 2021, 09:24:00 PM

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Hubchap

Would anybody be interested in an excel sheet with the correct spring rates for the OEM's? I am using Race Tech's spring rate calculator and putting the front and rear spring rate into an excel sheet. The setup I am using in the calc is standard stiffness(not leaning soft or hard), professional riding ability (because we are definitely riding/OJ'ing/Casing stuff much harder than we are IRL), and rider weight at 176 pounds (found the rider weight through the forums). I used spring conversion for the bikes with air forks and divided it in half because they only have one spring.

teeds

Would be interesting to see how their suggested spring rates perform in game, please post it.
"Damn dirt bikers!" - Bubba

Hubchap

February 21, 2021, 09:57:26 PM #2 Last Edit: February 21, 2021, 10:01:01 PM by Hubchap
Instead of the Excel I am just going to paste it here.
Settings used:
Type of Racing: Motocross/AMA Professional Supercross
Standard Age (29 or below)
Ability: Professional Rider
Standard Stiffness (not favoring soft or hard, right in the middle)
Weight: 176 pounds (according to this thread http://forum.mx-bikes.com/index.php?topic=3989.msg41694#msg41694)
For the bikes with air forks, I used the spring conversion and halved it for two springs.
Also had to do some conversion from kg/mm to N/mm, but the ratio is still very close and only usually dropped the value by 0.1 (like from 4.9 to 4.8)

Also, if anybody has any information on good spring rates for the TM's, please say because RT doesn't have anything on them unfortunately.

Also, if the value cannot be entered in game (example if it's 45 and you can only choose between 44-46 in game, experiment between the two, for the front I tend to go to the higher value and the rear I go to the lower if this is the case, but that's just my preference. Figure out what works for you. Even the website says use the closest available to their reccomendation.

Also, setting the sag correctly greatly helps cornering.

Key:                     
Bike Name
Motocross Front/Supercross Front
Motocross Rear/Supercross Rear

so if you want motocross, use the left side. Supercross is the right side. Front is on top, rear is on bottom.


KTM 125 (putting the key names here once for understanding)
46 front motocross / 49 front supercross 
44 rear motocross / 44-45 rear supercross 

KTM 150
46-47/49
44-45/45


KTM 250 SX
48/50
46/47

KTM 250 SXF
48/50
46/47

KTM 350 SXF
48-49/50-51
47/48

KTM 450 SXF
49-50/52-53
48/49-50

TC 125
46/49
44/45

TC250
48/50
46/47

FC250
48/50
46-47/47

FC350
48-49/50-52
47-48/48-49

FC450
49-50/52-53
48/49-50

YZ125
45-46/48
50/50-51


YZ250F
47-48/50
57/58

YZ250
47-48/50
54/54-55


YZ450F
52/54
56/56-57

KX250F 
47-48/50
54/55

KX450F
50/53-54
55/56

CR500 (2001, attempting to dial the 500AF in but this the 01 chassis, most likely not right)
48/50-52
58/58-60

CR500 (2020 CRF450 Specs NOT THE 21 MODEL, put in for more 500 testing, also may not be right but I feel this is better than the 01 stuff)
50/53-54
56/57-58

CRF250R (this might work with the 500 due to the 500AF's using CRF250 frames, so go stiffer if putting on the 500 due the 500's power strains on the suspension)
48/50-52
54/55-56

2021 CRF450R
50/52-54
56/57-58

96 CR250R (for Jeremy McGrath vibes)
47-48/50
56/56-58

96 CR125R (this one seems whack for a 125 but I assume it's becauase of the older designs, or maybe it's because it is a 96 125 so you have to seatbounce the shit out of everything to clear anything lol)
45/48
58/58-60     


RMZ-250
47-48/50
54/55

RMZ-450
50/53-54
54-55/56

Alta MX
52/54
58/58-60

Alta MXR
50/52-53
58/58-60

TM 250 MXI
unavailable
unavailable

TM 450 MXI
unavailable
unavailable

jtrs_61

February 28, 2021, 06:19:42 AM #3 Last Edit: February 28, 2021, 03:51:23 PM by jtrs_61
^^^ This is awesome.... Need to make this a PDF so can just pop that bad boy up when ya switch windows...  I just mentioned the RT calculator in another post that mentioned the 70/100 race sag setting, but RT gives ya like 106mm in the rear and sometimes gives you front preload of 2mm... what you recomend, 70/100 or RT?

Hubchap

I usually set the sag higher for outdoors and lower for indoors. 105 is where I shoot for

jtrs_61

Quote from: Hubchap on March 02, 2021, 11:36:09 PMI usually set the sag higher for outdoors and lower for indoors. 105 is where I shoot for

what aboot the front?

AZDesertRat

Quote from: jtrs_61 on March 10, 2021, 07:49:08 PM
Quote from: Hubchap on March 02, 2021, 11:36:09 PMI usually set the sag higher for outdoors and lower for indoors. 105 is where I shoot for

what aboot the front?


30

jtrs_61

Quote from: AZDesertRat on March 11, 2021, 03:16:55 PM
Quote from: jtrs_61 on March 10, 2021, 07:49:08 PM
Quote from: Hubchap on March 02, 2021, 11:36:09 PMI usually set the sag higher for outdoors and lower for indoors. 105 is where I shoot for

what aboot the front?


30

30?! static sag im assuming?

AZDesertRat

Correct, I've been using recommendations Stonerider posted a while back, which coincide with IRL settings.

"You want your race sag to be at 100mm (+/-10) at the rear, and 70mm (+/-5) at the front. (For supercross, it's better to set your sag at 60mm at the front.)
Your Static sag have to be around 30 (+/-10) at both ends.
To reach those values, you have to tweak your spring rate and preload button until you have it."

Gary

This may be a dumb questions, but with those  numbers for all the bikes listed above, is that the sag your talking about?

loganwren245

for the front spring rate, it doesnt go all the way up to the double digits, so for example when you put 46 for the front, do you mean 4.6? and its in metric measuring correct?