On Thursday, April 26, 2018 at 1:17:12 PM UTC+1, duane wrote:
I think my last bike came with an HG93. Anyway, it looks like the main
difference is the plating.

http://www.chainreactioncycles.com/c...ain/rp-prod656

http://www.chainreactioncycles.com/c...in/rp-prod6053

Oddly, CRC has the 93 priced a bit lower.

There's weirdness like this in many manufacturers' lines. Huge internet retailers select some item from a manufacturer's list as a best buy, buy a quantity so hew yuge that they have to schedule deliveries through the year, and get a deepdeepdeep discount, whereas of a lesser item from the same line they buy relatively few, and thus pay more per unit, and thus price the lesser item higher.

Another chain example: The right and most economical chain to fit to a Rohloff installation is undoubtedly the KMC Z8 in one of its variations (depending on whether you have a Chainglider fitted or whether you want a shiny open chain), a single speed chain that doesn't have a whole lot of side play built in because it isn't necessary. That's the theory anyway. The equivalent derailleur chain, with trickier construction to give the necessary flexibility for derailleur use, is the X8. However, for years now, it has been pretty obvious that CRC, whose head office is up the road here, buys the X8 in bulk and comparatively few of the Z8, because, generally speaking, and especially at big sales, the X8 is cheaper from them, as from most other really big dealers, than the Z8 -- if at any moment you can even order a Z8 from them.

I posted a worked cost-benefit analysis at
http://thorncyclesforum.co.uk/index....86976#msg86976
The Z7 RB is used in the table instead of the Z8 because that was the one we could get a price for. The Z8 RB is better but would be even less economical.

AJ
Of course it's bizarre to obsess about the pennies that chain wear costs, but I'm a bicyclist