In teh process of swapping over all the bits from one frame to another (Chromag Rootdown...can't wait to ride it), I discovered the list of things that should turn, but no longer turn was:
Bottom bracket
Top pulley wheel
Bottom pulley wheel...
No wonder the bike was becoming a pig to ride!
The crank axle was just turning in the top-hats, and the pulley bearings were seized right up.
All greased now, and BB replaced.
It's surprising into what state of disrepair a bike can get into if not ridden much!
DrP
The bit I've never been able to understand fully is why tyres go down when left in the shed, but same tyres will stay up if the bike is ridden.
centripetal force innit.
Centrifugal force forces the air to the outside of the tyre giving impression of constant inflation. Stationary wheels don't have this so look flat....or something
ahem, pedant alarm has gone off 🙂
http://www.diffen.com/difference/Centrifugal_Force_vs_Centripetal_Force
Not Coriolis force, then? 😉
It's not that they appear flat, they really do go down faster when not used.
You too must be using 26" wheels - they go down faster because off the smaller tyre size so 1cc of air is a bigger proportion of the smaller tyre volume.
🙂
I live in the Midlands, everything is central
It's surprising into what state of disrepair a bike can get into if not ridden much!
Garage Goblins... :fact:
[img] 
[/img]
It's coz they cry all their air out from being too sad.
Changes to centrifrugal force up north :-p