Ritchey frame: Seat tube
27.2mm seat tube with integrated seat collar (max torque setting: 6Nm)
Seat tube clamp size 28.6mm (2.5Nm max for derailleur clamps and chain guides)
Ritchey Classic 2 bolt Seatpost
27.2 x 350mm (including 100mm of minimum insert): $70
Offset 25mm
Weight: 260g (27.2x350mm)
The proven 2-bolt design on this classic provides a class-leading balance between strength, weight and adjustability. The two-bolt design is easy to adjust and holds tight. Its low profile clamp reduces stress on lightweight rails and won't bottom out, and the bolts are oriented to the axis of the rails for greatest contact area with the saddle. The Classic also features Ritchey's 'Classic' high-polish silver finish.
Ritchey Classic Zero Setback Seatpost
iconic high-polish silver finish; no-slip saddle engagement and high adjustability by securing the rails with fore and aft bolts.
Total length 350, 400mm (including 100mm of minimum insert)
Weight290g (27.2x400mm)
Nitto 65
Rene Herse: $86
27.2 mm diameter
Setback (centerline of post to center of cradle): approx. 18 mm (depends on seat angle)
Forged aluminum
250 mm or 300 mm long
Weight: 251 g (250 mm); 278 g (300 mm)
Single Bolt Design
Offset- ~25mm
Rail Clamp Width (Center-Center)- 44mm
Rivendell: Seat Post - Nitto S65 Crystal Fellow
Offset is approx. 18mm from center of pillar to center of cradle.
300mm
Nitto S83
Two bolt posts are usually overkill, but people generally like overkill, and on the other hand, sometimes they aren't overkill at all. They hold the saddle more securely than one bolt posts, but that fact suggests that Nitto's most popular post, the one-bolt Crystal Fellow, is minorly inferior, and it isn't. Here's what we think: Get the S-83 two-bolter if you weigh over 215 pounds and/or ride off-road and due to operator error or slow learning, you come down hard on the saddle often. Get the one-bolt Crystal Fellow if you don't.
Offset is about 20mm from center of post to center of cradle.
You shouldn't care, but the weight is 284.4 grams.
Grand Cru 0 Setback Seatpost, 27.2
Grand Cru Medium Setback Seatpost, 31.6mm
Grand Cru Long Setback Seatpost
two-bolt; 30mm of setback; internally ovalized to reduce weight to 301g; the head is integral with the post, not pressed on as on many modern posts. This makes them stronger and lighter. 27.2mm only x 300mm. Maximum height (above the min. insert line) is about 23cm. Weight = 282 gr.