Rail (625Wh) Coil spring weight

[monty1991]

Hi guys

Recently purchased an Ohlins coil for my rail 7 2022

plan to run it 230x 62.5 for 160ish rear travel, have 170 up front

ive tried a few different spring calculators and all suggest different weights

any help guys or suggestions?

TF suggest 484 lbs
Jtech suggest 579 lbs
suspension lab suggest 500

im 90kg unkitted so maybe 91-92 kitted

 

[Shjay]

TF told me to add the weight of your motor & battery to your weight to calculate spring rate

 

[monty1991]

TF told me to add the weight of your motor & battery to your weight to calculate spring rate

i added 7 kg when using ther calculator

 

[Paulquattro]

In and around my weight and i was 580 ish

 

[monty1991]

In and around my weight and i was 580 ish

Do you run it 62.5? Or 57.5?

 

[irie]

Hi guys

Recently purchased an Ohlins coil for my rail 7 2022

plan to run it 230x 62.5 for 160ish rear travel, have 170 up front

ive tried a few different spring calculators and all suggest different weights

any help guys or suggestions?

TF suggest 484 lbs
Jtech suggest 579 lbs
suspension lab suggest 500

im 90kg unkitted so maybe 91-92 kitted

Am 80kg kitted up on a 2022 Rail 5 Large with TTX22m.2 and Ohlins 525 spring, get about 25% sag. No issues at 57.5mm. Tried a 500 spring but didn't like it. Have 160mm Zeb Ultimate A2. Have a spare 170 air spring so might remove some spacers and try 160 rear (170/160), but can't fault 160/150.

Edit: 25%

 

[JP-NZ]

Hi guys

Recently purchased an Ohlins coil for my rail 7 2022

plan to run it 230x 62.5 for 160ish rear travel, have 170 up front

ive tried a few different spring calculators and all suggest different weights

any help guys or suggestions?

TF suggest 484 lbs
Jtech suggest 579 lbs
suspension lab suggest 500

im 90kg unkitted so maybe 91-92 kitted

I popped in 99kg (incl batt & motor) 62.5 stroke with 165mm travel on TF. Get a 500 spring should hit 30% sag

 

[RiderOnTheStorm]

@monty1991 Have you tried the MRP spring rate calculator? I went through the same process recently and MRP gave me the best recommendation. My desired sag (25%) was spot on.

Mountain Bike Spring Rate Calculator

Find out what spring rate you need for MRP springs as well as any other mountain bike spring.

mrpbike.com

 

[kombos]

I had good results with the Shockcraft calculator (cost a few $$).
They seem to input more variables than most other calculators.

 

[Koban]

Al those calculators are for indication. Unfortunately the can not give an exact number. Those calculators are not taking in account the bike character. Or personal riding preferences ;-)

Yes there are bike brands that created their own calculator for specific bike. These are doing a better job. The calculator can give you an indication for a spring. At the end there is also your own personal preference.

Some times you end up with 2 or maybe 3 springs to find out what the best one is for you.

I'm 78 kilo with clothes 80kg. On a Canyon Torque ON (180/175) Installed an Ohlins TTX22M2. Most calculators were around the 400lbs for 30% sag. Started with the 411lbs spring. This was giving me on my bike 33% sag. For my personal preferences this one did feel a bit to soft. To fast in the bottom out.

Then tried the 434lbs spring. That was giving a better feeling. I wanted to know wat the 457lbs would do on my bike. So I also bought this on. Now on 28% of sag with the 457. I will go back to the 434 for a few weeks to see what my personal preference says at the end. For now I'm happy with the 457lbs ;-)

 

[E Bob]

From what i can remember my rail was fairly linear "worth finding out" So a heavier spring would suit, the gen 2 levo had to be massivly over sprung as was a very linear bike, gen 3 took about 100 off the spring weight "same shock" as was a more progressive bike, also depends what your using the bike for, if your poodling round trails get a lighter spring for comfort, if your a bomber go heavier. hope this helps

 

[E Bob]

just noticed your fitting a shock with more stroke, more travel, a light spring will blow through that travel, also sit in the sag more, the 170 front has taken you higher, the rear won't. if i couldent try a spring, id go 550

 

[Paulquattro]

Do you run it 62.5? Or 57.5?

Hi
60mm i was running that at

 

[irie]

If I put the 170 air shaft in the Zeb A2 increasing front travel from 160 to 170, as well as removing coil spacers to increase rear travel from 150 to 160, I will also move the Minolink to 'High'. But Zeb A2+Trutune with Ohlins TTX22m.2 160/150 is better than me ...

 

[RiderOnTheStorm]

@monty1991 what is your Sag target? Did I miss this? Sag is key to estimate the appropriate spring rate.

MRP suggest 550lbs to achieve 24% sag with your settings.

 

[monty1991]

@monty1991 what is your Sag target? Did I miss this? Sag is key to estimate the appropriate spring rate.

MRP suggest 550lbs to achieve 24% sag with your settings.

View attachment 128650

I've always aimed for 30% on a air shock

 

[RiderOnTheStorm]

@monty1991 ok, so in that case, MRP would suggest ~450lbs to achieve your 30% sag objective.

When fitting my coil shock, I used the MRP calculator to get a ballpark spring weight which happened to match my sag target.

To fine tune the sag , you can play with the Preload adjustement ring e.g add one turn (but don't go over the max turns allowed).

I also "invested" in additional coils (+50lbs, -50lbs) for more flexibility when I go for longer rides (carrying heavier weight) or just want to adjust sag (at coil level) based on the terrain I'll be riding on.

 

[irie]

@monty1991
I also "invested" in additional coils (+50lbs, -50lbs) for more flexibility when I go for longer rides (carrying heavier weight) or just want to adjust sag (at coil level) based on the terrain I'll be riding on.

You change your springs "for more flexibility when I go for longer rides (carrying heavier weight) or just want to adjust sag (at coil level) based on the terrain I'll be riding on.???

 

[RiderOnTheStorm]

@irie yep, occasionally when planning a multiday ride with much heavier payload on my back, I would bump up the spring weight before the trip. Gotta maintain my Sag!

Swapping coils actually takes me less than 30min. No biggie! and no... I won't go back to air shocks...

 

[Like a Boss]

From Fox website:​ ​ Correction For Suspension Progression​ ​

Anything plus or minus (±) 7% can be ignored. Rising Rate (7% - 15%): subtract 50 lbs. Extreme Rising Rate - rare (15% - 25%): subtract 100 lbs. Falling Rate (7% - 15%): add 50 lbs. Extreme Falling Rate - common (15% - 25%): add 100 lbs. Or, simply ride with the calculated spring rate and let personal preferences make your determination.​

 

[Like a Boss]

I’m not sure how to determine if the Rail is falling or rising rate……maybe someone smart can say something about that.

 

[RiderOnTheStorm]

My understanding is the Trek Rail (9.9) suspension design has a progressive leverage ratio curve. The graph below shows a moderate and fairly constant progressivity. Hope this helps.

 

[Paulquattro]

The rail doesn't have a great progressive rear end
With bike parks and jumps etc I would blow through the spring normal xc riding and mild trails would be ok
I ended up going back to air some bikes just aren't progressive enough for coils and I like the adjustability of an air can in this instance
My previous bike had a much better progressive rear and suited a coil the rail in my opinion doesn't