Mountain Bike Reviews Forum banner
1 - 10 of 10 Posts

·
Unpredictable
Joined
·
2,213 Posts
Discussion Starter · #1 ·
Just curious and I know it has come up somewhere here; What is the plumb bob method of setting your seat fore/aft position? Nose of saddle over ??? Just picked up a new saddle with a different shape.
 

·
Registered
Joined
·
161 Posts
Additional question to this thread. Is Mojo designed for straight seatpost or fo offset seat post ? For me the setback Tompson (17 mm) meant the difference between L and M size. Finally I decided for M with setback but one never knows ?
 

·
bike rider
Joined
·
5,569 Posts
Sit on your seat and clip into your pedals. With the pedals level hang a plumb bob from the indent where the bottom of your patela meets your knee. It should intersect the pedal axle. That is the starting point and you may find you like it just forward or back from the pedal axle but it should stay very close when your saddle is at proper pedaling height. DON"T move your saddle to affect handlebar reach. Swap stems to do that. Saddle adjustments should only be used to adjust your possition over the pedals. Like everything there is some compromise. For steep climbing you will prefer a more forward possition. For powering on flat twisting singletrack you'll prefer a more rearward possition.
 

·
Registered
Joined
·
118 Posts
Something like this: While seated and clipped in on the bike, with the crank forward(parallel to the ground or the 3 o'clock position on the drive side). Hold the plumb bob string against the top of the shin, just below the bump of the kneecap, and the bob part should align with the ball of your foot/pedal axle.

This is just a starting point, and you should be in the ballpark. Little things, like how you rotate your hips or hold your foot, will throw this off. Everyone's physiology is a little different, and when I ran this on my Mojo my knees were not happy. I moved my seat far enough back that I really ought to have a setback seatpost, but for now I'm cheating. And my knees are happy.

So my question is: if you are far outside this range, forward or aft, does it affect the efficiency of the suspension?
 

·
Registered
Joined
·
223 Posts
All good advice, but I just want to stress again that it is a very loose starting point.

In a perfect world, you would be able to set the saddle in a position that gives maximum power AND provides for acceptable climbing balance AND perfect cornering balance. That is what I've achieved with the Mojo. I've found that if I can't achieve the above, then the bike is wrong size, or some part of the geometry is incompatible with me.

The Mojo seems to work very well with a zero setback post.
 

·
bike rider
Joined
·
5,569 Posts
The farther back you move the more air you'll want to add to maintain proper sag. Other than that the suspension should be fine. Do you find yourself having to scoot to the very tip of the saddle during steep climbs or wheelying with your seat back? How far behind the pedal axle is the plumb bob now?
 

·
Unpredictable
Joined
·
2,213 Posts
Discussion Starter · #9 ·
Thanks everyone. Actually I have never measured anything other than by feel so I can't comment on my current position or what comes next. Was just interested to do the check after I set the new saddle up to see where I am relative to the starting point. I run a 100mmm stem and tend to sit a little above handlebar level, but am thinking adding some spacers under the stem, so having that starting point may be helpful.

New saddle just arrived. Should look good. Sella Italia Yutaak on an orange mojo. Hope my butt agrees. Oh and yes I do end up right on the tip of the current saddle when climbing steep grades. At the moment I am using a cheapo, but initially comfy Specialised that now sags like an old horse, so it forces me to move right forward. I prefer to climb seated so it feels quite OK to be on the nose anyway.
 

·
Reviewer/Tester
Joined
·
6,176 Posts
I remember reviewing the Yutaak for MBA. I personally found it as hard as a brick, but heavier riders found it more 'friendly'...

It would look good on an orange Mojo... :thumbsup:
I had it on my NinerBikes One Niner during the test which was an orange frame, it looked good on that.

R.

Ridnparadise said:
Thanks everyone. Actually I have never measured anything other than by feel so I can't comment on my current position or what comes next. Was just interested to do the check after I set the new saddle up to see where I am relative to the starting point. I run a 100mmm stem and tend to sit a little above handlebar level, but am thinking adding some spacers under the stem, so having that starting point may be helpful.

New saddle just arrived. Should look good. Sella Italia Yutaak on an orange mojo. Hope my butt agrees. Oh and yes I do end up right on the tip of the current saddle when climbing steep grades. At the moment I am using a cheapo, but initially comfy Specialised that now sags like an old horse, so it forces me to move right forward. I prefer to climb seated so it feels quite OK to be on the nose anyway.
 
1 - 10 of 10 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top