2018 TC125 spring rate help.

10/13/2018 3:03pm
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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Paw Paw 271
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Benton, LA US
10/13/2018 3:08pm
Yes you can just do the spring change and be ok.

Paw Paw
Bruce372
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10/13/2018 4:03pm
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
1
crc245
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10/13/2018 6:55pm
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...
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
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)...
10/13/2018 7:41pm
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.

The Shop

Bruce372
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10/13/2018 7:55pm
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
10/13/2018 8:11pm
Bruce372 wrote:
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...
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
Didn’t think of that! Should be a bit easier. Thanks for the tip!
macz400
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League City, TX US
10/14/2018 4:45am
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...
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.
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
opyguy
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10/14/2018 6:00am
193 lbs
Went to .45 from .42 on my 250sx, you will probably need same

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