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Installing the spider ring?
You'll need to remove the DS crank with the correct tool, pop it in a softjaw vice then use the lock ring tool to remove the lock-ring, which has a normal threading. The spider will then slide off the back of the crank with a bit of persuasion. Pop the ring on in its place - you can't mount it incorrectly - then pop a bit of loctite on the lock-ring threads and bolt it down to the curiously specific 47nm, which is tight-as if you are a 60kg weakling like me.
If you are just changing chainrings there's nothing specific about it, same as any other crank.
Howard-
Yes mate! Thanks for the info. Struggled to find a comprehensive guide online. Have got all the tools so should be good to go thanks to you.
In other news... Bought a synapse hi mod ultegra from Paul's Cycles. They sent the wrong colour and it came with a 32t cassette and medium cage mech when it was listed as 11-28. They're sending me a replacement cassette but still a bit of a ballache. Price was pretty good though so not grumbling too much. £40 for short cage mech and might keep the medium cage one, cassette and compact rings just in case I need to ride up any vertical walls into gale force headwinds
mrJL
Anyone got a good guide/manual for swapping chainrings on hollowgram sl cranks? Or is it pretty intuitive? Attempting it for the first time tomorrow...