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Useful video of the tool in use.
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Ctc forum have quite a lot of information on the 'shimming' of shimano freehubs to remove the play. This post includes a diagram of the freehub internals.
https://forum.cyclinguk.org/viewtopic.php?f=5&t=145496
To get into the internals of the freehub to remove a shim you'll need a tool. Search freehub removal tool on eBay.
If you can't remove the play with cassette spacers I'd maybe look at this.
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https://www.bikeforums.net/bicycle-mechanics/538058-wobbly-freehub.html
Mountain Bike Performance Handbook by Lennard Zinn:
"5.2C: Tightening up a Wobbly Freehub.
Many freehubs wobble as they spin. You can see it when the bike is free-wheeling. Grab your freehub and rock it to see how much play yours has. Eliminating the wobble will improve shifting and reduce freehub wear and friction.
You can practically eliminate the wobble in a Shimano freehub by removing one internal shim. The shims are inside to account for possible deviations in manufacturing tolerances. Since it is better to have a wobbly freehub than one that is too tight to turn, the shims are automatically installed in all freehubs to add a little play. Remove the thinnest shim, and reassemble the freehub, tightening the hub bearing race down fully with the tool. The freehub should spin freely without rocking. The cogs will now stay in line and shift faster.
If removing the shim tightens the freehub too much, yet there is play in it with the shim installed (or if there is still play after removing the shim), you can eliminate the play with some sanding. Sand the bottom of the hub-bearing race by rubbing it on a piece of sandpaper held down on a flat surface. You are sanding the surface at the end of the threads. Reassemble the freehub with one or both shims installed, whatever works best."
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These don't come with a lockring.
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I have a pair that came with a second hand Checkpoint. They stop me very well but have warped slightly so replaced with the same. Can't say how they compare to Rt 800. I'd say excellent at this price.
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Cheap 700x2.15in Almotion
https://www.wiggle.co.uk/schwalbe-marathon-almotion-touring-tyre
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Thanks for the detailed response. Really useful!
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Hi. I'm interested in how you attached the contacts to the fork dropouts. Did you drill 3 holes for the insulating plate and stick it on somehow? I have the same wheel which I would like to use, but until seeing this I haven't found a way to get it to work without a custom fork etc.
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https://m.soundcloud.com/nebuchadnezzariii/leprosy-beginners-guide-to4th-edition-2137989-snippet