- News
- Reviews
- Bikes
- Accessories
- Accessories - misc
- Computer mounts
- Bags
- Bar ends
- Bike bags & cases
- Bottle cages
- Bottles
- Cameras
- Car racks
- Child seats
- Computers
- Glasses
- GPS units
- Helmets
- Lights - front
- Lights - rear
- Lights - sets
- Locks
- Mirrors
- Mudguards
- Racks
- Pumps & CO2 inflators
- Puncture kits
- Reflectives
- Smart watches
- Stands and racks
- Trailers
- Clothing
- Components
- Bar tape & grips
- Bottom brackets
- Brake & gear cables
- Brake & STI levers
- Brake pads & spares
- Brakes
- Cassettes & freewheels
- Chains
- Chainsets & chainrings
- Derailleurs - front
- Derailleurs - rear
- Forks
- Gear levers & shifters
- Groupsets
- Handlebars & extensions
- Headsets
- Hubs
- Inner tubes
- Pedals
- Quick releases & skewers
- Saddles
- Seatposts
- Stems
- Wheels
- Tyres
- Health, fitness and nutrition
- Tools and workshop
- Miscellaneous
- Tubeless valves
- Buyers Guides
- Features
- Forum
- Recommends
- Podcast
forum
Is it a bad idea to use a shim for my seatpost?
I'm keen to change my aluminium post for a carbon one but I'm struggling to find one I like/can afford in 30.9.
I've seen plenty in 27.2 and have a reducer shim from my mtb. Would this be a daft idea with a carbon post, especially considering I'm 115kg?
If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.
Latest Forum Topics
Latest Comments
- rickiecheese 3 sec ago
An update regarding this path....
- tigerted 6 min 8 sec ago
Give my regards to Gary great fella.Last time the Tour was over here I went to Dover to watch the start at the Castle & discovered I needed a...
- Simon E 4 min 10 sec ago
I've used mark1a's post as a template. My current subs:...
- chrisonabike 35 min 24 sec ago
I'll have to find an hour or so to go through that... good work....
- tony.westclassics@live.co.uk 1 hour 42 sec ago
Theres no boubt about it, this bloke is the kiss of death
- don simon fbpe 1 hour 14 min ago
As you agree with me, I don't understand your point.
- Rendel Harris 1 hour 18 min ago
Absolutely without a doubt, a small example recently: I was cycling down The Mall in London from Buckingham Palace towards Admiralty Arch and...
- Rendel Harris 1 hour 52 min ago
The jacket looks funky but as far as I can see from the photographs isn't anything like as bright when hit by light as ProViz or similar more...
- cardch 2 hours 58 min ago
Just ordered mine. Went to visit them and it's a great setup, and so nice (I hope) to get something with a bit of soul, rather than another...
- Smac9 3 hours 38 min ago
I think the 2.5 star rating is a bit mean . I own one of these and have no issues using them. I am not a chemical engineer so cannot verify the eco...
Add new comment
3 comments
Thanks chaps. That was my train of thought, and why I'd never dream of doing it with my MTB. Having searched around, I've also found a few posts (including the FSA) for around £50 in a 30.9, so all good.
I just need to find a matching stem and bars, 'cos I'm a tart!
as a fairly heavy rider too, who's broken more than one frame at the seat tube/top junction i'd tend to agree with shaun. by adding the shim you're decreasing the area over which the forces are dissipated through that critical junction (unless you can find a really long shim). so it's more likely to break.
you can get cheap carbon posts in 30.9 though... this one http://tinyurl.com/cqpgn8
is only 30 quid and you can get decent FSA and Kore ones for around 50 notes
I would shy away from this practice. Most budget "Carbon" models are pretty hardy in my experience but given your size and weight it would be very, very painful were one to fail and you'd void the warrantee into the bargain.