BB cup lost its thread, is this just normal wear or other?
I was out yesterday and it looked like my drive-side BB had come loose. Just stripped it and somehow the BB cup has lost the majority of its threads. As per the picture (one on the right) 3/4’s of it has lost just over 0.5mm diameter.
Hope Ceramic BB, nearly 4 years old and done an awful lot of k’s (probably 10,000). I guess luckily its on a Ti frame, so doesn’t seem to have affected the BB threads.
Well maintained, and stripped/cleaned often.
Posted 5 years ago
It turned out the spacers were too soft and the bb cup worked lose, destroying the thread. Hope now supply a different type of spacer. I contacted hope and they repaced it for free with new spacer.
Interesting as I’ve replaced the spacers regularly as they were ‘squashing’… Thanks, will call them tomorrow.Posted 5 years ago
The original BB consisted plastic spacer between the frame and the cup, but this was replaced by alloy spacers. I think the combination of a slight amount of play and hard titanium threads is what did it.
Agree, but based upon a friends alu Trek wrecking its BB threads, rather it was the BB cup than the frame.Posted 5 years agosmiffMember
didn’t realise this was so common. luckily cups are normally softer than frame (6061 cups, 7075 frame in my case, or steel, or ti), otherwise you could have trashed frame.Posted 5 years ago
shimano still give plastic spacers on the cheapest ht2 bb cups too. do not use these for reasons above.
You guys need to tighten the BB cup better on installation.
Says a man with no idea of what is going on…
The spacers that Hope originally supplied were some fibre type material, this broke up so they switched to aluminium. The damage to mine was caused due to a spacer that disintergrated..
Anyway, just been speaking with them and there was no issue with a replacement cup (and washers, enough for both my Hope BB’s) and they’re also putting in new ceramic bearings (at cost price).
Good lads.Posted 5 years ago
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