2018 TC125 spring rate help.

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10/13/2018 3:03 PM

Hey so I bought a TC125 just for practice. Anyways I’m a bit heavy for it at 200 lbs. forks are air so I can add some pressure. it says it the manual I’d be good on a 42 NM Shock spring. 39 is stock. Can I just do the swap, set sag and ride? Or with the heavier springs does anything else need to be done in the valving? I’m just an average C rider. Thanks for the help.

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10/13/2018 3:08 PM

Yes you can just do the spring change and be ok.

Paw Paw

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10/13/2018 4:03 PM

You might need a 45 at 200lbs.

You want to get 105mm sag with 6mm preload on the spring. Took me a while to figure some of the quirks out on these new Austrian bikes after years on Japanese bikes

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10/13/2018 6:55 PM

Bruce372 wrote:

You might need a 45 at 200lbs.

You want to get 105mm sag with 6mm preload on the spring. Took me a while to figure some of ...more

This.

Should be able to find decently priced OE takeoffs from modern 250SXF (42) and 350/450SXF's (45N/m); Experiment and see what works best. 42 starting point should be close with the lighter-weight of the 125 (appx. 20lbs less than comparable Austrian 4T's)...

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10/13/2018 7:41 PM

Thanks guys. I’ll throw the 42 on tomorrow and see how the sag is. Luckily I’ve got a 42 and a 45 on the shelf.

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10/13/2018 7:55 PM

Evan_Denysiuk1 wrote:

Thanks guys. I’ll throw the 42 on tomorrow and see how the sag is. Luckily I’ve got a 42 and a 45 on the shelf.

Measure the free length, set your sag and then measure the compressed length.

To change the spring, just undo the back linkage bolts, loosen the preload, unclip and drop the spring out the bottom... no need to take the shock off

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10/13/2018 8:11 PM

Bruce372 wrote:

Measure the free length, set your sag and then measure the compressed length.

To change the spring, just undo the back ...more

Didn’t think of that! Should be a bit easier. Thanks for the tip!

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10/14/2018 4:45 AM

Evan_Denysiuk1 wrote:

Hey so I bought a TC125 just for practice. Anyways I’m a bit heavy for it at 200 lbs. forks are air so I can add some ...more

If I were you at your weight, I'd go for a .45 like others have stated. I'm at 175lb on my 18 150SX and running a .42. At that spring rate, I'm also running 127psi in the fork. Works great

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10/14/2018 6:00 AM

193 lbs
Went to .45 from .42 on my 250sx, you will probably need same

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