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What makes Shimano bottom bracket (splined) so great?(4 posts)

What makes Shimano bottom bracket (splined) so great?Pan
May 23, 2001 3:07 PM
Been riding a bike that didn't have splined bottom brackets. I must be ancient but can someone tell me what the advantages are?
re: What makes Shimano bottom bracket (splined) so great?grz mnky
May 23, 2001 3:12 PM
Primarily lower weight with the hollow models. That and the fact that you can only use their cranks designed for to that spline. the fact that it's pattened keeps you as a captive customer.

There are some wear and reliability issues. Square tapered cranks tend to get sloppy with lots of on/off while the slined does not. You can also mess up a crank for a splined BB if you don't align everything.
re: What makes Shimano bottom bracket (splined) so great?Jamm
May 25, 2001 11:14 PM
The biggest issue is not reduced weight, but overall stiffness, the hollow one has a larger diameter, thus less flex. The splined interface has much more contact points/area, thus less flex.

"fact that it's pattened keeps you as a captive customer" this is true with Campy component systems as well.
re: Not much....Stu in Leavenworth
May 23, 2001 9:38 PM
....A bit lighter,a bit stiffer,if either really matters. Most could not tell the difference. The best campy stuff still uses the old square taper. Maybe they "don't get it".