Shimano XTR SP-M900 Seat Post

• Overview...
• Intended for mountain biking, but some have used for BMX racing
• Released in 1992 and advertised by Shimano until 1995
• Popular throughout the mid- to late-1990's
• Shimano's top-of-the-line seat post
• Features...
• Lightweight construction
• Easy installation
• Easy setup
• Secure holding force
• Simple and elegant design
• Details...
• Material: aluminum clamp pieces, heat-treated Cr-Mo (chromoly) shaft
• Forming: cast clamp pieces,
• Assembly: clamp press-fit 1" deep into top of shaft
• Color: black shaft, silver clamp pieces
• Finish: finely polished (clamp pieces), painted (shaft)
• Logo: silver
• Minimum insertion length:
• Specs...
• Diameter (shaft): 26.6mm, 26.8mm, 27.0mm, 27.2mm
• Length (shaft): 280mm, 330mm, 360mm (27.2mm Ø only),
• Weight: 261g (26.8mm), 270g in 330mm length (Source: 1993 & 1994 Shimano Catalogs)
• Other...
• MSRP:
• Made in Japan

Sources for this Reference Page

• Shimano, 1992 Catalog (https://www.retrobike.co.uk/gallery2/d/ … mano92.pdf)
• Shimano, 1993 Catalog
• Shimano, 1994 Catalog, p. 18-19 (XTR)
• Shimano, 1995 Catalog, p. 8 (XTR)

Bike-Pro Publications, 1996 wrote:

SHIMANO M-900 XTR SEATPOST
The XTR post is styled like the XT post, but has the aluminum clamp pieces far more finely polished than XT model. The XTR head and clamp pieces are similar to those used in the XT post. The head piece is cast aluminum with a knurled upper surface where the lower clamp piece contacts it. In the middle there is a slot milled out, to permit the fastening bolt to move forward and backward, as needed, in adjusting the angle of the saddle. The head piece is tightly press fit to a depth of 1" into the Black painted, Cro-moly heat treated steel tubing section. The lower clamp piece is finely cast aluminum with four knurled points of contact to the head piece. The middle of the lower clamp piece has an oval shaped hole down from the upper clamp piece for a mated protrusion, to lock the two in the correct position prior to tightening. The upper clamp piece is made of cast aluminum, also finely polished, a hole through the middle of the protruding oval is threaded for the steel fastening bolt. The fastening bolt that passes up through the head piece and both clamp pieces is Chrome plated steel with a 5mm hex head fitting for tightening, it's threaded with a 8mm by 1mm thread pitch and is 30mm long. The steel fastening bolt is replaceable with a Titanium model found at the end of the article. The head and clamp pieces are left in their natural Silver color rather than painted Black, and appear to be barrel polished with final hand polishing. With the clamp perpendicular to the tubing section, the center of rail to end of tube length is 329mm. The weight of a 26.8mm XTR post is 261 grams. The Shimano XTR post is available in, 26.6mm, 26.8mm, 27.0mm, and 27.2mm sizes.

URL: http://www.bikepro.com/products/seatposts/shimpost.html
Source: Bike-Pro Publications
Date: 1996

Page Created: 5/17/2021  ----->  Info Updated: N/A
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