tf tuned vs mojo spring calculator

haroexone

i find that mojo's calculator recommends harder springs than tf tuned.i would like to know how they actually work it out.does anyone know?

dave_s

Why not ask them, you might get blinded by science though.
I'm not sure how they work it out but I sent my 5th Element shock to TF Tuned Shox for revalve and a travel mod because it was like a pogo stick when I got it on a standard 05 SX Trail frame.
They just asked me for my weight and the type of riding I do and the shock was absolutely perfect when I got it back.
TF Tuned and Mojo really know their stuff so it's best to contact them direct if you need advice rather than use the calculator.
Not sure about Mojo but TF Tuned expect you to fill in a job request form for work on shocks and they make sure you provide all the info they need to setup your shock for you.

John

Aparently the 2 companies have different ideas about how bikes should behave,

Mojo think the bike shouldride over the rough stuff so they set the suspension up pretty hard, TF think bikes should go through so set the bike up softer so the wheels can extend into dips etc..

Hard to explain but Dirt mag had a big thing about it all a while ago, Personaly Ive only used TF in the past on my 5th but now my bikes only running Fox I think there are isues with TF geting Fox parts so I may have to try MOJO out.

havent fallen off,
im just having a rest

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Sir HC

Equation I use for calculating the spring rate of cars.

=4 x(PI Squared) x(Ride frequency squared)x Sprung mass x (Motion Ratio squared)

Mojo/TF must use a ride frequency of around 1.8Hz

The sprung mass is you and any parts of the bike that arn't rigidly connected (so not the wheels, fork lowers, discs half the damper)

Motion ratio is the ratio between the travel of the frame the travel of the shock. On some designs, the motion ratio will vary through the travel, so this will have to be an average.

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haroexone

sir hc,have you tried the above formula for your bike?

Sir HC

Yes and it does work.

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haroexone

ta.ill try working it out later.i wonder why pi is involved.....

Sir HC

I'd trust the TF tuned/mojo more than mine though. As they have a lot more experience at fettling bike suspension than I have.

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