Hello!
I have used Kohla Alpen Top hiking poles (discontinued) for 2 seasons until I broke them – no complains there though, what I did would break any pole, physics. After that I switched over to Black Diamond Spire Elliptic trekking poles (http://www.backcountry.com/black-diamond-spire-elliptic-trekking-pole). It is not that I was not satisfied with the Kohlas but rather to test something new (the locking system, and the claimed stiffer design) and because of rather positive reviews. As a side note my trekking buddy stayed with his Kohlas.
I used the Spires on a few 2-3 day hikes in the local mountains with no issues, except for the NOISE, these poles are loud! The Kohlas in comparison are a whisper.
Then came the bigger challenges – a 2 week GR20 Corsica traverse and a 2 week Iceland N-S traverse a year later.
After the GR20 the tips looked very abused but still usable, after the Iceland trek though they basically disintegrated (see picture).

The Kohla tips, which had much more mileage on them and also were used during the same GR20/Iceland treks look like they can still go on for years.. Apart from normal wear/scratches the tips seem unharmed.
Back to the Spires. I did not want to buy new poles obviously, so I looked around for replacement tips. All I can find are the flex tips (http://eu.blackdiamondequipment.com/en/ski-poles/flex-tip-BD1120740000LNG1.html). I bought a pair, put them on, but already after the first day they look like this:

Is it possible that these poles can no longer be used? I am thinking that perhaps after the BD tips disintegrated I abused the aluminium tubes too much. Because of this they are now too short for the flex tips which would otherwise fit much tighter on the aluminium and not bend as in the photo. I would see this as the only explanation, otherwise I cannot think of a use case for the flex tips.
Do I need to buy new poles ?
edit: I just thought that I could shorten the rubber tips by cutting them in half, but then could not make use of any baskets


