Bottom brackets
- Thread starter bojangle
- Start date
hesdownagain
Old School Hero
To be honest i've never had a problem with shimano. i have a hope one on another bike which has not given me any trouble if i was going to replace the shimano it would be with a hope. just done another build using the x-type but cannot say about that as it's not been used yet.
tintin40":3jyodeon said:
I've been told by at least one retailer that the Axix BBs aren't that well sealed and was warned off getting one for off-roading.
A web search turned up this Tange offering which looks very nice although hard to come by in the UK:
http://www.tangeseiki.com/tangeseiki_ne ... 145430.png
David
JamesM
Senior Retro Guru
I don't think anyone ever thought outboard bearings would be better. What they thought was that larger diameter axles would be better, and they were right. The trouble is they left less room for the bearings inside the standard size BB shell. So smaller bearings were used, but these wore out quicker. They then moved the bearing outboard of the BB shell so they could increase the axle diameter further and use large bearings again. The trouble here though is they are more exposed to dirt ingress. Early ones suffered badly, however newer designs seem to last well.
There are now a few new BB shell standards apearing BB30, BB91 etc. these have a larger diameter allowing even larger axles with large inboard bearings. The trouble is at the moment there seems to be a few different standards, some of which will go the way of the betamax video no doubt. That's okay though because who keeps a bike frame for more than a few years anyway!!!
There are now a few new BB shell standards apearing BB30, BB91 etc. these have a larger diameter allowing even larger axles with large inboard bearings. The trouble is at the moment there seems to be a few different standards, some of which will go the way of the betamax video no doubt. That's okay though because who keeps a bike frame for more than a few years anyway!!!
silverclaws
Senior Retro Guru
Reading recently about a bunch of tourers, who go all over the world off road and on, they recommend square taper as it seems to be the hardiest and less troublesome,. I suppose much can be said about, if it ain't broke, don't fix it. I have never had problems with square taper, apart from getting the buggers out when they are shot, so I see no reason to change.
The other thing about going to a different standard, is one is limited to that standard, but if taper fits are used in industry, then they are good enough for me. Experience of taper fit pulleys driving stone cutting blades, driven by crude agricultural type engines in very abrasive conditions by unskilled get the job done yesterday type operators.
Sometimes the race mentality is not good in all applications.
The other thing about going to a different standard, is one is limited to that standard, but if taper fits are used in industry, then they are good enough for me. Experience of taper fit pulleys driving stone cutting blades, driven by crude agricultural type engines in very abrasive conditions by unskilled get the job done yesterday type operators.
Sometimes the race mentality is not good in all applications.
