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extra long setback seatpost?

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extra long setback seatpost?

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Old 01-18-11, 03:57 PM
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john_iverson
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extra long setback seatpost?

Hey all, I have a friend w/ some medical issues who recently acquired a tricycle type bike. Long story short, he needs to be sitting a little farther back in relation to the bottom bracket than the normal 20-30mm setback posts will allow.

Anyone know where I can find something like this in a 28.6 post?

Thanks!
John
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Old 01-18-11, 04:33 PM
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Originally Posted by john_iverson View Post
Hey all, I have a friend w/ some medical issues who recently acquired a tricycle type bike. Long story short, he needs to be sitting a little farther back in relation to the bottom bracket than the normal 20-30mm setback posts will allow.

Anyone know where I can find something like this in a 28.6 post?

Thanks!
John
Titec made the Hellbent with a 1.5" setback. You have to be careful, however because it put a lot of leverage on the seattube/toptube junction.

I happen to have one at home. Let me check the size and I'll get back to you.
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Old 01-18-11, 06:54 PM
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Plain seat post in needed diameter, Kalloy makes them,
Brompton Saddle adapter pin and their Penta clip saddle clip.

SAP is horizontal when installed on a standard 7/8"OD top seat post,
the stepless, mostly aluminum,
180 degree adjustable clip, will hold the saddle over the horizontal tube .

Todd at Clever Cycles in Portland does this setback mod a lot for 'dutch bike' riding postures, on your typical UJB frame .

I agree , seat post insert depth cannot be too short.

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Old 01-18-11, 09:47 PM
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My Hellbent is a 26.8. All the right numbers but in the wrong order. Sorry.
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Old 01-18-11, 10:03 PM
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Thx for checking Mr. Cycco!

Fietsbob: We already have a "plain seat post" if what you are referring to is one of the low end jobs w/ a reduced diameter @ the top end to fit a separate clamp to mount the saddle. I'll check w/ Clever Cycles to see if this is a workable solution.
Thx much for the input!

John
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Old 01-18-11, 10:11 PM
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use a 28.6mm to 27.2mm shim on the one at the bottom.

45mm setback
http://www.ambrosio.co.uk/ambrosio_seatposts.htm

Alternatives: velo orange grand cru, 32mm setback or nitto wayback from riv bike, +40mm.

there was also a ritchey 45mm setback seatpost, but that was only available in 31.6mm


yet another alternative is to find a specialized saddle your friend likes, because they have a lot of rail for adjustment.
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Old 01-19-11, 08:20 AM
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Originally Posted by AEO View Post
use a 28.6mm to 27.2mm shim on the one at the bottom.

45mm setback
http://www.ambrosio.co.uk/ambrosio_seatposts.htm

Alternatives: velo orange grand cru, 32mm setback or nitto wayback from riv bike, +40mm.

there was also a ritchey 45mm setback seatpost, but that was only available in 31.6mm


yet another alternative is to find a specialized saddle your friend likes, because they have a lot of rail for adjustment.
I thought of suggesting a shim with my Titec post but rejected it upon further consideration. A long seatback post strains the seatpost collar and the seat tube/top tube junction. The Titec that I have broke a frame at that junction, even though the post has plenty of insertion. A shim would have to extend way down into the frame to avoid putting additional pressure on the junctions. It's best to have the properly sized post with this post

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