Removal methods for rubber bar grips

[plancashire]

Those look like wide lolly sticks. Can you still buy those? They will cost a fraction of the price of anything medical. As I mentioned, a plastic spudger used for electronics disassembly will work and keep working for a long time. You can buy these from iFixit.

[AndyB1]

Simple - slit the old grips with a sharp knife and throw away.
Fit new / better quality grips like Egron or much cheaper copies from ebay that clamp in place so are easy to remove in the future and which are more comfortable to use.
The old grips will probably have started to rot so why reuse?

[plancashire]

That's what my LBS wanted to do with my 2004 Brompton grips. The bars are an unusual size and Ergons or any good quality grips are not available, although I later found some Brompton push-on ones at Brilliant Bikes. I used alcohol and a screwdriver to remove the old grips, which are still in good nick after 20 years.

In our volunteer workshop we try to reuse as much as possible, so we don't slit grips. Our clients can't afford Ergons.

[Brucey]

.... Poisson's ratio applies very much to rubber.....

one of my lecturers swore blind that rubber had a PR of 0.5. A 'evidence' for this assertion he claimed that, to a first approximation, an inflated inner tube merely becomes fatter rather than longer as well. I didn't altogether believe him, because, unlike him, I had actually tried it. Perhaps the PR of rubber isn't quite unity, who knows? However, there can be little doubt that grips tend to get tighter when you pull on them.

Incidentally, it occurs to me that if you don't have a stash of tongue depressors, an ice-lolly stick would probably do.

[Jdsk]

.... Poisson's ratio applies very much to rubber.....

one of my lecturers swore blind that rubber had a PR of 0.5. A 'evidence' for this assertion he claimed that, to a first approximation, an inflated inner tube merely becomes fatter rather than longer as well. I didn't altogether believe him, because, unlike him, I had actually tried it. Perhaps the PR of rubber isn't quite unity, who knows? However, there can be little doubt that grips tend to get tighter when you pull on them.

Incidentally, it occurs to me that if you don't have a stash of tongue depressors, an ice-lolly stick would probably do.

Wikipedia has about 0.5 for rubber:
https://en.wikipedia.org/wiki/Poisson%27s_ratio

and includes:
Most car mechanics are aware that it is hard to pull a rubber hose (such as a coolant hose) off a metal pipe stub, as the tension of pulling causes the diameter of the hose to shrink, gripping the stub tightly. (This is the same effect as shown in a Chinese finger trap.) Hoses can more easily be pushed off stubs instead using a wide flat blade.

Jonathan

[Brucey]

I think it is quite false to claim that the reason car hoses get tighter when you pull on them has much to do with the PR of rubber. IMHO it has much more to do with the fabric reinforcement, which is commonly arranged like a Chinese finger trap.

[rogerzilla]

It's still Poisson's ratio at a whole-material level. Those of us who had to study civil engineering and read Prof J E Gordon's very entertaining books "Structures" and "The New Science Of Strong Materials" will remember the discussion of the bias cut in women's dresses. The dress hangs under its own weight, but the 45 degree weave causes it to cling around the lumps and bumps.