Carbon rails question

clickshots
Posts: 91
I have a Giant Defy 1 from 2009. I'd like to fit a new saddle and I liked the look of the Pro Turnix (hopefully it will fit me ok!), I just wasn't sure if it was compatible with my seat post. One of my friends seems to think that the rails will be a different size because they're carbon, but there doesn't seem to be any information about the rails on the website.
Any ideas if it'll fit? I have the original Giant carbon seat post.
Any ideas if it'll fit? I have the original Giant carbon seat post.
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Some of the carbon rail saddles have oval rails, if your seatpost clamps top to bottom it shouldn't be an issue but I know from experience that certain seatposts require a change of clamp, Ritchey for one.0
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I'll have to find a shop I guess.
If it doesn't fit, can anyone recommend a 30.9mm seat post that will fit carbon rails.
OR
should I buy a 27.2mm seat post and use an adaptor, seems like 30.9mm is a bit of an oddball size.0 -
A giant Defy with a 30.9 seat post!!! Are you sure?Yellow is the new Black.0
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100% sure.
This is a Giant Defy 1 from 2009.0 -
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I think that your seatpost will be ok. If it isn't there's plenty out there that will be, Ritchey(2 bolt), 3T, Fizik Cyrano....... just Google.0
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I've ordered the saddle at my local shop, I'll see what turns up at the weekend0
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Right, doesn't fit :-P
Can anyone recommend a 30.9mm seat post that's relatively lightweight and takes carbon rails? The shop has none. Seen a few advertised as being for MTB, does that make a difference? Or should I just use a shim and buy a 27.2mm?0 -
Shims and slimmer posts look shoot and will certainly negate the weight saving of the carbon rails.Yellow is the new Black.0
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Presumably you have something like this -
http://www.tredz.co.uk/.Giant-Connect-SL-Seatpost_67401.htm
Looking at the head of that I can see why ovalised rails wouldn't fit.
These look like they should work though -
http://www.chainreactioncycles.com/truvativ-noir-t40-seatpost/rp-prod84855
http://www.wiggle.co.uk/thomson-elite-setback-seat-post/0 -
No I had a different style post, that must be a newer design I guess.
Anyway I managed to find a Giant post that was 30.9mm and fit (only) ovalized rails. Apparently on my new post you get different clamps, so if I go back to my old saddle I need to use my old post or get the other type clamp. So I got there in the end!
Oh and the new post is lighter than my old carbon post, so with the saddle I took 250g off the bike, which isn't to be sniffed atDown to 7.5kg now which isn't bad for a large sized Aluminium Giant Defy :-P
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Well I can completely inderstand your confusion (how many versions??)!
Glad you got there in the end and 7.5 is a nice weight for that bike (I'd bet you could drop >100g by changing the fork as well if that's stock).0 -
I should mention mine is a triple so I could probably take a bit of weight off there if I swapped to a double.
That would be a big job though and I'm kind of lazy :-P0