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  #1  
Old 06-25-2017, 10:14 PM
fatsanta92 fatsanta92 is offline
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Seat Post Offset

I'm building up a new Scott Addict Team Issue frame that comes with the stock seat post.

I've been fitted on my BMC RM02 with their stock, 15mm offset, seatpost. The Scott comes with a 25mm offset seatpost.

Should I give the 25mm a test or order a 15mm offset seatpost?

Or should I try to move my saddle around so the reach matches the BMC and Scott?

Last edited by fatsanta92; 06-25-2017 at 10:32 PM.
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  #2  
Old 06-26-2017, 02:42 AM
rustychisel rustychisel is offline
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Seat tube angle? That should help the dilemma, because you're no doubt aware balance on the bike [fore and aft] is important.

Anyway, 10mm adjustment isn't much, BUT if trying get the right position requires having the saddle ALL THE WAY BACK on the rails then I urge you to consider the shorter offset. The increased leverage by pushing a saddle all the way back can have disastrous consequences.
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  #3  
Old 06-26-2017, 07:22 AM
fatsanta92 fatsanta92 is offline
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Quote:
Originally Posted by rustychisel View Post
Seat tube angle? That should help the dilemma, because you're no doubt aware balance on the bike [fore and aft] is important.

Anyway, 10mm adjustment isn't much, BUT if trying get the right position requires having the saddle ALL THE WAY BACK on the rails then I urge you to consider the shorter offset. The increased leverage by pushing a saddle all the way back can have disastrous consequences.
BMC is 74.2, looks like the Scott is a 73.3

If memory serves correct (as I'm away from my bike as I type this), my saddle sits somewhat center, leaning more towards the front on the BMC seatpost.

I'll check when I get home later today.
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  #4  
Old 06-26-2017, 06:49 PM
John H. John H. is offline
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setback

Always set up ideal saddle position 1st- then set reach relative to that.

If BMC is ideal- figure out how far it is behind bb. Then achieve same setup on Scott.

Quote:
Originally Posted by fatsanta92 View Post
I'm building up a new Scott Addict Team Issue frame that comes with the stock seat post.

I've been fitted on my BMC RM02 with their stock, 15mm offset, seatpost. The Scott comes with a 25mm offset seatpost.

Should I give the 25mm a test or order a 15mm offset seatpost?

Or should I try to move my saddle around so the reach matches the BMC and Scott?
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  #5  
Old 06-26-2017, 08:01 PM
fatsanta92 fatsanta92 is offline
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Quote:
Originally Posted by John H. View Post
Always set up ideal saddle position 1st- then set reach relative to that.

If BMC is ideal- figure out how far it is behind bb. Then achieve same setup on Scott.
Good to know, what is the best way to go about figuring this out? What points do I measure from?
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  #6  
Old 06-27-2017, 04:45 PM
rellis rellis is offline
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Dave Kirk posted this in 2015. Works and is simple. Pictures aren't displaying though.

http://forums.thepaceline.net/showpo...&postcount=534
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  #7  
Old 06-28-2017, 03:51 PM
fatsanta92 fatsanta92 is offline
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Originally Posted by rellis View Post
Dave Kirk posted this in 2015. Works and is simple. Pictures aren't displaying though.

http://forums.thepaceline.net/showpo...&postcount=534
Wish that had pictures, I'm more of a visual person

But I think I can get it.

Well see how that goes
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  #8  
Old 06-28-2017, 04:31 PM
Andy sti Andy sti is offline
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You need a corner wall to place the bike against. Measure distance from wall to center of BB and wall to tip of saddle. The difference is your setback. Now place the Scott in the same place and adjust so that setback number is the same.
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  #9  
Old 06-28-2017, 08:05 PM
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MauiHoss MauiHoss is offline
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Quote:
Originally Posted by fatsanta92 View Post
Wish that had pictures, I'm more of a visual person

But I think I can get it.

Well see how that goes
Here you go... I don't remember where I found these but I'm pretty sure these photos go with Dave's post.
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  #10  
Old 06-29-2017, 10:04 AM
chiasticon chiasticon is offline
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Quote:
Originally Posted by fatsanta92 View Post
BMC is 74.2, looks like the Scott is a 73.3
seems to me you'll have to go the other way: zero offset post. almost an entire degree slacker STA may equate to a cm more offset, with the saddle rails clamped to the same position. then using a post with another cm of offset from what you had means you'll be 2cm back from where you were fit; no bueno. then you'll have to jam the saddle forward 2cm on that 25mm offset post and may be near the limits of where it can be clamped.

this all assumes, of course, that you're clamped to the center of the 15mm offset post right now. if your saddle's slammed way back on it, you'll be fine with the 25mm offset post.
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  #11  
Old 06-29-2017, 07:49 PM
Clean39T Clean39T is offline
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Quote:
Originally Posted by MauiHoss View Post
Here you go... I don't remember where I found these but I'm pretty sure these photos go with Dave's post.
Want. That. Bike.
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