Me vs. The Rain
Join Date: Jul 2004
Location: Stumptown, OR .... er Southern California
Bikes: Lugged steel
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Vintage racers used to repack hub bearings with light oil, but this had to be redone after each stage/race as it would all run out after a point.
The performance difference that you will feel will be negligible to say the least, and a pain in the arse maintenance-wise. This would be akin to saying you are going to start using cold-pressed vigin olive oil in your engine because it will reduce friction and increase your mileage 1-2 mpg. You would then have to change the oil every 30 miles, but it would be worth it for the performance gain, correct?
Now, repacking with a grease designed for lower-temperatures is not a bad idea at all. But on a fixie every bearing surface is always spinning, effectively warming everything up enough already. People have traditionally had more problems with the cold and oil or air sprung suspension forks than bearings, etc.
If you can find it, KluberLube from Munich is great stuff - I used a lot of it while doing tribology research in Germany. Several varieties for all range of temperatures, plus it looks and smells like honig.