e-rider
Banned member
- Location
- South West
what a crazy thing to do - seriously
Possible frame issue?
- Thread starter User16625
- Start date
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I see. I guess I'll find out for myself soon enough. There's also a fair weight saving considering my current seatpost is pretty hefty at 340g
Why would that be?
I like Skol
A Minging Manc...
- Location
- Sunny Ashton-under-Lyne
How long is the shim, 60mm maybe? How much seatpost is showing out of the frame? By fitting a shim you are trying to control all the leverage caused by the seatpost in just a couple of inches. If the seatpost is a proper sliding fit in the frame then the whole length of post that is inside the frame is used to stop any rocking of the seatpost, hence no movement/creaking.
100mm in the case of the one I've ordered. In any event, you seem to be ignoring the fact that many people use shims without suffering any rocking or creaking and that the OP's frame in particular seems to be prone to this problem.
Rocking is a bit extreme anyway, it's hardly like it's rattling around in there.
Cyclist33
Guest
- Location
- Warrington
How much of a weight saving are you getting for what, £80 or similar? Is it a significant amount, eg >1% of the total weight of bike and rider?
Smokin Joe
Squire
- Location
- Bare headed cyclist, Smoker
I've used seat posts made from steel, aluminium and carbon fibre and if there is any difference in ride quality between them I've never found it.
I suspect a bit of marketing bullshit is behind most of these wonder claims made about different materials.
£25 for a 200g seatpost saving 140g against my current seatpost. It's not just the weight, but plenty of people spend far more on lighter saddles or whatever. It's not a big deal, but if you added or took away 140g from half the components on a bike it would soon add up.
Same could be said for clipless pedals (that's just an example) or any number of things like saddles with carbon bases and titanium rails. However, I appreciate your opinion as I haven't tried a carbon seatpost before, but others have reported improved compliance. I'll have no problem in coming back and agreeing with you if I don't see a difference.
At the end of the day I found my Specialized Allez frame with its 27.2mm ali seatpost horribly non-compliant. I've had to replace it due to a damaged top tube and the new frame has a 31.6mm seat tube so I would like to do what I can to maximise comfort while I'm at it. I'm not telling anyone they should do the same, just trying it for myself.
I'll let you all know how I get on. 
Indeed, I have a pair of 25mm tyres on the way - just got the dispatch confirmation from Ribble at 09:25 this morning. The new frame doesn't look like it will take 28's.
Cyclist33
Guest
- Location
- Warrington
£25 for a 200g seatpost saving 140g against my current seatpost. It's not just the weight, but plenty of people spend far more on lighter saddles or whatever. It's not a big deal, but if you added or took away 140g from half the components on a bike it would soon add up.
Same could be said for clipless pedals (that's just an example) or any number of things like saddles with carbon bases and titanium rails. However, I appreciate your opinion as I haven't tried a carbon seatpost before, but others have reported improved compliance. I'll have no problem in coming back and agreeing with you if I don't see a difference.
At the end of the day I found my Specialized Allez frame with its 27.2mm ali seatpost horribly non-compliant. I've had to replace it due to a damaged top tube and the new frame has a 31.6mm seat tube so I would like to do what I can to maximise comfort while I'm at it. I'm not telling anyone they should do the same, just trying it for myself.
But, you're not taking 140 g off half the components. Just one.
140 g. That must be 1 - 2 % of the bike weight, or less than 0.2 % of the weight of bike + rider.
Don't get me wrong if you want it get it, but don't make miracles in your mind
mind. 25 quid is cheap for a carbon seatpost. Is it full carbon or alloy with cosmetic carbon wrap?
fossyant
Ride It Like You Stole It!
- Location
- South Manchester
Nothing wrong with dropping a little weight here and there.
Like has been said, don't expect it to be any comfier. Standard carbon seatpost are stiff but light. The compliant ones have built in elastomer like some of the Spesh or Canyon posts and are designed for flex
Like has been said, don't expect it to be any comfier. Standard carbon seatpost are stiff but light. The compliant ones have built in elastomer like some of the Spesh or Canyon posts and are designed for flex
Of course, but each bit helps and contributes to a greater overall saving. This is one of the seatposts I'm looking http://www.ebay.co.uk/itm/301538111285. I'm not expecting miracles here; just thought I'd try one out.
I have eliminated the shim issue by swapping the seatpost with the one in my MTB. Fortunately the shim fits in my MTB and my MTB seatpost (without shim) fits in my road bike. Havent ridden my SCR properly yet but I will update this thread after a few rides.
The SCR seatpost needs to be inserted considerably further into my MTB to achieve the right height than it did on the road bike. I imagine this might reduce leverage at the clamp/shim area and it will be interesting to find out if this setup reproduces the same problem on my MTB. I dont ride my MTB anything like as much as I ride my road bikes.
The SCR seatpost needs to be inserted considerably further into my MTB to achieve the right height than it did on the road bike. I imagine this might reduce leverage at the clamp/shim area and it will be interesting to find out if this setup reproduces the same problem on my MTB. I dont ride my MTB anything like as much as I ride my road bikes.
DAM IT! Hasnt worked although the creaking has a slightly different sound. Definitely a frame issue as the creaking disappears when I take my weight off the seat. Cant see any cracks around the welds at the seat tube, (inside or outside).
