1. ## KS Lev sizing

Sorry for being so verbose. I’m trying to make this so you can figure everything out on your own.

Please: I put a hell of a lot of time into this. I didn’t call KS and do this write-up for me—I already had it figured out. Help me understand if projects like this are worth my time by giving this post a “pos rep” if it helped you. I like to be helpful; but if I'm wasting my time I would really like to know. I have lots of other things I could do.
Potential Problem
You don’t want a seat post that extends past your maximum riding height; else hitting the button will raise the seat too high.

Preventing Potential Problem
1) Using the seat you will put on your Lev, the seat collar you will use with your Lev, and your current seatpost, set your seat to the highest height you will use.

3) In the table below select the Lev that is lower than the “Min Extended Rail Height” you calculated in step #2. Note: These numbers lack any “fudge factor”; so be sure not select a post that is longer the “Min Extended Rail Height” you calculated in step #2. A few mm too short is much better than a few mm too tall.

4) If don’t ride with your seat slammed against the frame (e.g. perhaps you like pressing your thigh against the seat for control so you keep it up a bit higher) then do these additional steps:
a) Using the seat you will put on your Lev, the seat collar you will use with your Lev, and your current seatpost, set your seat to the lowest height you will use.

b) Measure the distance from your seat collar on your frame to the center of your seat rail.

c) Take the difference of the highest height you will use measurement (from step #2) and the lowest height you will (from step #4b).

d) Using your results from step #4c, select the Lev with the closest “Travel”. If you are between two seatpost travel lengths, discard any post that has a “Min Extended Rail Height” greater than the highest height you will use (calculated in step #2). If neither post has a “Min Extended Rail Height” greater than the highest height you will use then you have two options:
i) If you value the lowest height you use more than the highest height you use then choose the longer of the two lengths. That will give you the closest match to highest height you will use.

ii) If you value the highest height you use more than the lowest height you use then either length will work. If you select the longer travel Lev then your bottom seat position will be “that” much lower (“that” being seatpost travel minus the results from #4c). If you select the shorter travel Lev then your bottom seat position will be “that” much higher (“that” being the results from #4c minus seatpost travel).

I cannot overemphasize:Do NOT select a Lev if the “Min Extended Rail Height” is great than your measurement obtained in step #2.

Useful info in Millimeters
 Travel Min Slammed Rail Height Min Extended Rail Height Max Extended Rail Height LEV 100 31.6 350 100 59 159 225 LEV 125 31.6 385 125 59 184 265 LEV 150 31.6 435 150 59 209 315

Useful info in Inches
 Travel Min Slammed Rail Height Min Extended Rail Height Max Extended Rail Height LEV 100 31.6 350 3 15/16 2 5/16 6 4/16 8 14/16 LEV 125 31.6 385 4 15/16 2 5/16 7 4/16 10 7/16 LEV 150 31.6 435 5 14/16 2 5/16 8 4/16 12 6/16

KS Lev Specs (in millimeters)
 Overall Length Min Post Insertion Max Post Insertion LEV 100 31.6 350 335 110 176 LEV 125 31.6 385 385 120 201 LEV 150 31.6 435 435 120 226

Note
Different size bikes of the same model will not require the same length of seatpost. Example: I have a 33” inseam and 150 seatpost will work for me on a medium but not on a large (FYI: I have 170mm crankarms, which makes my seat position 5mm higher than 175mm crankarms in my "ideal pedaling position").

Since the bottom bracket heights are the same, I think you can use the stand over height as rough approximation of the difference between seat post exposure on one bike size and another.

2. I just measured the amount of necessary exposed post for the LEV 150, and you need 8.625" from the saddle rails down to below the knurled collar.

EDIT: This is tough to measure(just measured again and took pics) since not all parts are flush and the rails are at a different angle. I would say plan on 8.5" just to be sure, but you *might* be ok at 8.375".

Related question, how much can you slam the LEV? I see that the cable attachment point can hangover a seatpost clamp, so if your clamp was thin enough could you slam the LEV all the way?

4. Originally Posted by Dusty Bottoms
I just measured the amount of necessary exposed post for the LEV 150, and you need 8.625" from the saddle rails down to below the knurled collar.
That's 14mm more than I would have expected.

I just measured my Lev 125 and got 7.156" (181.8mm) which is about what I get get from my calculations below.

5. Originally Posted by Calhoun
Great minds I guess... (Ryan got me thinking about this the other day when he posted that he bought a large Chili so he would have less seatpost exposed.)

Related question, how much can you slam the LEV? I see that the cable attachment point can hangover a seatpost clamp, so if your clamp was thin enough could you slam the LEV all the way?
The distance from collar to rails will be 55mm (+1 or 2mm) when slammed as low as it will go. For comparison: my Thompson Elite is 28mm from collar to rails when slammed.

6. Hmm... worded that wrong I guess.

How far down does the base of the post go?

On Dusty's pic at at 8.5" will that part go all the way to the top of your seatpost clamp?

7. Thanks for posting this. Helped me realize a 150 won't work, so I'll have to go with a 125mm.

8. Originally Posted by Calhoun
On Dusty's pic at at 8.5" will that part go all the way to the top of your seatpost clamp?
Dusty's right--it's a ***** to measure. In Dusty's pic you can see that the base part starts at 7" and extends down to 8 3/16"; making it at least 1 3/16" (30.2mm) long. Above the shaft you've got 25mm or so where the seatpost clamps to the rails. Those two combined is where I get my 55mm.

That said, I think Dusty is smart in adding a little fudge factor as I don't think you would want to rest your seatpost directly on the your clamp; and too high is much worse than too low. Changing my 55mm into 60mm is the safe thing to do.

Edit: added a 5mm safety margin into my original post, so you get the 60mm I mentioned above.

9. So I run about 9" of exposed post from seat collar to rails in climbing position. I assume I can use the 150?

10. I did more research and edited my original post so it contains all the information you should need.

11. You'll be fine.

Originally Posted by Herzalot
So I run about 9" of exposed post from seat collar to rails in climbing position. I assume I can use the 150?

12. Thanks TSC and Dusty. Looking forward to getting down to get down and vice versa.

14. Anyone having trouble with the Lev returning the last 20-25mm of travel? is it break in or maybe try bumping the PSI?

-RT

15. How tight do you have the seat post clamp tightened/torqued. I noticed when mine was torqued to the recommmended 7Nm, it was a bit sticky. I back it off a bit and all was fine.

16. I'll back it off from 7nm and see if that works.

Gracias!

17. THANK YOU!!!
Yes, I did mean to yell that.
-G

19. TSC, this is very helpful. My clamp top to rails on rigid post is 185 mm at roadbike style pedaling height. So I am going for the 125 travel. I don't have a mm to spare, but seems a shame to go 100 travel. Consensus from others? Thanks

20. Originally Posted by hoolie
TSC, this is very helpful. My clamp top to rails on rigid post is 185 mm at roadbike style pedaling height. So I am going for the 125 travel. I don't have a mm to spare, but seems a shame to go 100 travel. Consensus from others? Thanks
From my OP, the 31.6mm Lev has min height of 2 5/16" to rail height when slammed; so the seat that's probably about 3.5". If that's the seat height you prefer when descending then the 125mm is what you want. If you rarely ever put your seat that low when descending, then you may want to go with the shorter 100mm Lev which will raise your minimum seat height to ~4.5”. And the 100 should save a bit of weight and money.

21. One additional comment on sizing. Make sure to check the maximum insertion depth in the seat tube for your bike. My bike has a max insertion depth of 185mm and my collar to rail distance is 200mm. The LEV 125 just fits but i'm out of luck if I want to lower the max saddle height. The LEV 100 gives me more flexibility on max saddle height but less travel. I'm still trying to decide which way to go.

22. Originally Posted by Dusty Bottoms
I just measured the amount of necessary exposed post for the LEV 150, and you need 8.625" from the saddle rails down to below the knurled collar.

EDIT: This is tough to measure(just measured again and took pics) since not all parts are flush and the rails are at a different angle. I would say plan on 8.5" just to be sure, but you *might* be ok at 8.375".

Damn. I'm at 8.75" Just a hair too much, right? I suppose this bike is just too small for me after all!

23. Originally Posted by thechez
Damn. I'm at 8.75" Just a hair too much, right? I suppose this bike is just too small for me after all!
maybe I need more coffee to process this, but what do you mean? Dusty is pointing out the minimum that the post needs to extend from the frame. 8.75"> 8.5" ?

24. I mean at the lowest position I want the seat to be it's at 8.75 for the min extended rail height. That would mean that even a 150 wouldn't be long enough to fit where I need it, correct? Or am I reading it all wrong?

25. Hmmm. I've had more coffee and I'm still not sure what you are asking.

What frame do you have? What size is it?

The LEV seatpost total length is 435mm (~17".) If you take into account the minimum frame insertion of 120mm for a 150 post, your post could be as tall as 12.4" not including saddle height.

What Dusty and other are illustrating above is that if you need less than 8.5" of seatpost (at full height) the 150 Lev will be too tall.

26. Okay. That's what I'm trying to confirm. My seat height now is at 8.85" from collar top to bottom of the seat rails. I wasn't entirely understanding the wording about min height. So a 150mm would work for me then?

27. Based on the numbers I'd say yes.

Any of your riding buddies have one you can test fit?

28. Okay. Thanks Calhoun.
But this is where I get confused: "In the table below select the Lev that is lower than the “Min Extended Rail Height” you calculated in step #2." My numbers are higher than the min height.

No. Nobody I know has a 150mm. I just got a 125 for my other bike and that was big. Now to find the same deal I got on the 125. Under \$300 is always a score with these Levs.

Go 505!

29. This is very helpful, ks needs to put at least the minimum extended rail height on their site. UOTE=TSC;10154522]Sorry for being so verbose. I’m trying to make this so you can figure everything out on your own.

Potential Problem
You don’t want a seat post that extends past your maximum riding height; else hitting the button will raise the seat too high.

Preventing Potential Problem
1) Using the seat you will put on your Lev, the seat collar you will use with your Lev, and your current seatpost, set your seat to the highest height you will use.

3) In the table below select the Lev that is lower than the “Min Extended Rail Height” you calculated in step #2. Note: These numbers lack any “fudge factor”; so be sure not select a post that is longer the “Min Extended Rail Height” you calculated in step #2. A few mm too short is much better than a few mm too tall.

4) If don’t ride with your seat slammed against the frame (e.g. perhaps you like pressing your thigh against the seat for control so you keep it up a bit higher) then do these additional steps:
a) Using the seat you will put on your Lev, the seat collar you will use with your Lev, and your current seatpost, set your seat to the lowest height you will use.

b) Measure the distance from your seat collar on your frame to the center of your seat rail.

c) Take the difference of the highest height you will use measurement (from step #2) and the lowest height you will (from step #4b).

d) Using your results from step #4c, select the Lev with the closest “Travel”. If you are between two seatpost travel lengths, discard any post that has a “Min Extended Rail Height” greater than the highest height you will use (calculated in step #2). If neither post has a “Min Extended Rail Height” greater than the highest height you will use then you have two options:
i) If you value the lowest height you use more than the highest height you use then choose the longer of the two lengths. That will give you the closest match to highest height you will use.

ii) If you value the highest height you use more than the lowest height you use then either length will work. If you select the longer travel Lev then your bottom seat position will be “that” much lower (“that” being seatpost travel minus the results from #4c). If you select the shorter travel Lev then your bottom seat position will be “that” much higher (“that” being the results from #4c minus seatpost travel).

I cannot overemphasize:Do NOT select a Lev if the “Min Extended Rail Height” is great than your measurement obtained in step #2.

Useful info in Millimeters
 Travel Min Slammed Rail Height Min Extended Rail Height Max Extended Rail Height LEV 100 31.6 350 100 59 159 225 LEV 125 31.6 385 125 59 184 265 LEV 150 31.6 435 150 59 209 315

Useful info in Inches
 Travel Min Slammed Rail Height Min Extended Rail Height Max Extended Rail Height LEV 100 31.6 350 3 15/16 2 5/16 6 4/16 8 14/16 LEV 125 31.6 385 4 15/16 2 5/16 7 4/16 10 7/16 LEV 150 31.6 435 5 14/16 2 5/16 8 4/16 12 6/16

KS Lev Specs (in millimeters)
 Overall Length Min Post Insertion Max Post Insertion LEV 100 31.6 350 335 110 176 LEV 125 31.6 385 385 120 201 LEV 150 31.6 435 435 120 226

Note
Different size bikes of the same model will not require the same length of seatpost. Example: I have a 33” inseam and 150 seatpost will work for me on a medium but not on a large (FYI: I have 170mm crankarms, which makes my seat position 5mm higher than 175mm crankarms in my "ideal pedaling position").

Since the bottom bracket heights are the same, I think you can use the stand over height as rough approximation of the difference between seat post exposure on one bike size and another.[/QUOTE]

30. Originally Posted by thechez
Okay. Thanks Calhoun.
But this is where I get confused: "In the table below select the Lev that is lower than the “Min Extended Rail Height” you calculated in step #2." My numbers are higher than the min height.

No. Nobody I know has a 150mm. I just got a 125 for my other bike and that was big. Now to find the same deal I got on the 125. Under \$300 is always a score with these Levs.

Go 505!
Alright, I am back to confused.

You cuurrently have a 125 and "that was big." Does that mean it is too long? If you already have a 125 use the numbers from the diagram and go from there. Set your post like it's the 150mm. Or follow the steps Belladonna has laid out.

31. Greetings. Is there a way to figure out what length post you need without having the bike you plan on installing it in. I recently ordered a medium Chilcotin and a some parts to go with it (parts are here, bike will be another week). I was unsure as to what length post, but ended up ordering the 150 lev. FWIW I ride a 17.5 trek slash now with a 125mm reverb. I went ahead and measured from the collar to the rails and came up with 210. Is there anyway to correlate that number to the knolly (I hope that makes sense)? Thanks.

32. This is wonderfully helpful. Trying to figure out what bike options will work.
Anyone have numbers on whether the Integra measurements are different? I have a hunch that the maximum insertion length is less. Also seems like the newest posts have different collars that might change things by a few millimeters here and there between models.

33. I have a large Chili, and the 150 Lev. I'm 6'1", and find that the post is nearly perfect. With the collar slammed and the post 100% extended, it isn't quite high enough for long uphill climbs or long XC, but if I raise the whole post about 1", it's perfect. I slam the post down on the downhills, and is sits perfectly between my thighs for bike control. 125 would be way to short, because I like my seat low when I head downhill.

34. /\ /\ /\ /\
With all due respect, I'd say you have the best fit given the products that are available. Far from perfect though.

35. Perfect is subjective, inherent in the fact it's a post about my experience.

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