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As to just making changes because the machinery is worn out, note that Shimano still makes both square taper and Octalink bottom bracketrs despite the fact that the vast majority of the OEM market has made them obsolete.This reminds me of he Bob Newhart skit about General Chariots board meeting. "Do these holes in the chariot sides serve any purpose?" Someone has the temerity to ask. "Yes they serve a purpose: they keep us employed next year" the CEO replies.
It's an outrageous lie that square taper bb's are no longer available, even from Shimano. Bikes stores that tell you this are quite literally ripping you off. They should be held to account.Good point about the UK conditions. Actually it wasn't the BBs but the square taper cranks the man said were unavailable. Because the originals were so old and beat up I was worried about them breaking so I asked him to put new cranks on as well. Thanks for the reassurance Ron. It seems like I'll be OK this year with the Hollowtechs but I don't suppose I'll get 50,000 out of them! I'm rather attracted to the Hope BB not only is it good kit but they are made in a village, Barnoldswick*, near where I grew up in Yorkshire. Hey ho perhaps it's time I got a new bike. You could call the one I've got now The Bike of Theseus.
Just Google UN55 (the Shimano bb at the most reasonable quality/price point for touring bikes) and you'll find literally hundreds of offerings.
However I have toured many thousands of kilometers on a Hollowtech bb also, with no issues at all.
It is posible that users who ride a lot in wet, muddy UK conditions would experience more issues, but then they probably have more issues even with square taper bb's.
Early failures on Hollowtech II bottom brackets can be caused by poorly faced, out-of-alignment bottom bracket shells. If those reporting the early failures have badly aligned frames, it would explain a lot as no bearing will tolerate much of that.Thank you Dave that makes sense.
Because questions had been raised as to Hollowtech durability I came here to get the experience of people who have actually done some touring with these things. Yes, judging by the tone of the only responses I got it was a waste of timeNo I have no personal proof and I didn't come to that conclusion, other people did. As for personal proof, of course not, that's why I've raised this question. Check the link to the CTC website. In particular TrevA who says I got sick of replacing the bearings on the Hollowtech every 2-3000 miles. The general opinion there is that Hollowtech BBs don't last as long as STs. Russ I've as much reason for taking TrevA at his word as I have for taking you at your word.
Why are you wasting the time asking these questions? You don't want to believe this other person you cite on the other forum, and you don't want to believe my opposite opinion. I suggest you resolve this conflict by flipping a coin. Heads this bottom bracket/crank, tails the other.
Curious how you came to this conclusion that "ST BBs last much much longer than Hollowtech." Do you have any actual personal proof? Or are you just making up stuff off the top of your head? I am aware most science and rebuttals of science are done this way now days. Testing, proof, observation is so out of date.No I have no personal proof and I didn't come to that conclusion, other people did. As for personal proof, of course not, that's why I've raised this question. Check the link to the CTC website. In particular TrevA who says I got sick of replacing the bearings on the Hollowtech every 2-3000 miles. The general opinion there is that Hollowtech BBs don't last as long as STs. Russ I've as much reason for taking TrevA at his word as I have for taking you at your word.
I don't know who told you about 2,000 mile failures but that seems absurd unless they criminally abused their bikes.Again, check the link.
That's the place. Actually it's new name is Burien Cycle. It used to be a branch of Bicycles West but is no longer. I believe it's independently owned now. Their prices always seem pretty good.When we got to Oakland CA for a ride down the coast I decided we needed a chain long enough to lock both our bikes up. I went into a bike shop on the waterfront and found a Kryptonite chain for $62. So I bought one and well it served. After I got back I went to my LBS, Burien Bikes,
Burien Bikes, huh? Is it the one called Bicycles West just east of Ambaum and north of 152nd? I grew up going to that bike shop in the 1950s and 1960s and have bought bikes and much gear there.
$30 is a cheap price for not having to go all the way home to get a chain.Very true John but it is quite a difference. But then if we never forgot anything we'd be perfect - actually I didn't forget, it wasn't until someone on the train down suggested I needed a good lock in San Fransisco that I even considered it. I did have my flimsy cable lock that I believe the ACA says is all you need on their tours but I don't suppose they spend much time in San Fran.
I had SD-7's on a Surly Cross Check and the braking power (with Kool Stop Salmon pads) was plenty good but they were very squeal prone and nothing I did quieted them down reliably. Substituting road brake pads and holders for the OEM ones helped a bit but not enough. My solution was to sell the bike and replace it with a Pacer and caliper brakes. These are always quiet.Looks like it's a design issue with the 520, some marriages are just not made in heaven. Possibly the SD-7 and 520 forks are just not made for each other so to speak. I also replaced the original levers (no idea what brand they were) with Tektro SR520s, it may have been a combination of the two replacements that fixed my problem. The back brake is still the original SD-7 and it's just fine, quiet and works well.