Val always had me use a healthy dose of Power Punch Gear Additive in there. This stuff is super tacky (tackier than way oil used on machine tools) and seemed to work nicely in the hubs.
Plus it is made in Seattle (or at least my 10+ year old bottle of it was).
I don't have an S7 anymore, but I still have a nearly full bottle of this stuff. Maybe I'll put some in my Nexus/Alfine hubs when they need a lube dip.
] on behalf of aarons_bicycle_repair [aaron@...
Sent: Friday, October 28, 2011 1:56 PM
Subject: [Geared_hub_bikes] Re: Anyone oil lubed a S7?
The Sachs/SRAM Spectro 7 is the best, most durable IGH on the market next to the Rohloff, in my opinion. I love that hub!
It burns my britches that SRAM discontinued it. I supported that hub for over 10 years! I have most repair parts in stock and we have a few left. There are 11 left in a warehouse in Germany, I want to buy for the shop. The failure mode of this hub is great too. The sliding keys that fix the 3 sun gears are designed to shear, which leaves the hub in 4th gear. This allows you to ride home in a reasonable gear. I have good stock of the sliding keys! I used this hub on my StokeMonkey'd Bakfiets for 3 years. I kept shearing the sliding keys, but on steep hills with a load. I would be surprised if a normal bike with a normal sized rider did that. I finally replaced it with a NuVinci and a Schlumpf up front. Now I have 2 times infite gears! The only other wear I saw was to the planets and sun gears. The ring gear showed no wear. After cleaning, the hub worked fine even with the worn gears, just a little rough. We use blue marine grease for the bearings and coaster brake shoes and on the planets. Be careful not to use too much near the sliding keys because it can cause one to stick. Phil Wood Oil works great and mixes well with the marine grease. I have no experience with automatic transmission fluid since it never gets below 20 degrees F, here in Seattle. Val Kleitz at the Bikesmith used to use 90W gear oil (for an automotive rear differential. Motor oil is designed to work at high temperatures, as it ATF. Gear oil makes more sense to me since that part of a car does not get that hot.
--- In Geared_hub_bikes@yahoogroups.com, "Dan Burkhart" <boomer5319@...> wrote:
> Some years ago, I came into posession of a NOS Sachs S7 coaster brake hub. Given that it is a Sachs branded hub, I have to assume it is at least 11 or 12 years old.
> I'm finally ready to take it out of the box and build up a bike around it, but I'm thinking the factory lube might have passed it's best before date.
> I've not yet opened the hub to look, but I was thinking about giving it a dunking in ATF and greasing the bearings.
> Any experience, thoughts or cautions about doing this?
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