carbon saddle rails and clamps

Discuss light weight issues concerning mountain bikes & parts.

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02GF74
Posts: 577
Joined: Thu Jan 13, 2011 4:04 pm
Location: Sunny UK

by 02GF74

many seatposts have a bottom clamp whose full width contacts the saddle but with two narrow upper clamps (1). The result being a scissor type action which I've read is a no-no for carbon railed saddled.

Is there an after market top piece that will support a wider part of the rail? The best top clamps I've found is again posted below. Is there another option e.g. using a semi-circular alloy tube to cover the rail? (3)

Also re. the cylindrical top clamps as in (1) - they are thinner hence look weaker than the wider ones (3) - should I be worried about them failing?

Examples of each are below
1, narrow top clamps
Image

2. wide top clamp, much more support for rails.
Image

3. wider top clamps
Image

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Klaster_1
Posts: 450
Joined: Mon Aug 15, 2016 10:25 am
Location: Krasnoyarsk, Russia

by Klaster_1

02GF74 wrote:The result being a scissor type action which I've read is a no-no for carbon railed saddled.

I've been running this type of clamp across several bikes (road/mtb), carbon-railed saddles and seatposts and nothing bad happened at all. A lot of other member do the same too.

02GF74 wrote:Is there an after market top piece that will support a wider part of the rail?

Berk's seatpost will probably have one (see this post, towards the end), Jure also makes a similar custom top-clamp.

by Weenie


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