Just wonder how often to pull the rear axle and re-grease in there?
Depends on the brand and model of hub you have. Some are quite serviceable (Shimano or Shimano like) with loose ball bearings and cone races. Others use sealed cartridge bearings that aren't really that serviceable and generally are just replaced when they are no longer smooth.
I go through my Shimano hubs annually with Bel Ray water proof grease. Mostly preventative maintenance and they are always clean inside.
Some good videos out there, along with various threads on bicycle sites.
I picked up my cone wrenches years ago, I think they are cheapo Spin Doctor stuff from Performance bike. Nothing special. Don't use them for anything other than cones, they are thin and won't take to being used on any "real" bolts or nuts.
That reminds me, I should probably go through mine, it's been a few years. Oh and you might want to go on ebay or similar and buy a ball bearing kit. The usual advice is, if you drop a ball just toss it. Or just replace in the first place. And don't put in just one new ball with a bunch of old balls as the sizes won't match. I forgot how the grading works but I think it refers to how well matched the balls are to one another--so 25's are better than 100, that sort of thing. Me, I'm not competitive enough to notice so I run just a decent of bearings, nothing ceramic for me.
2011 Toyota Camry, base, 2.5L/6MT, 196k, hers 2010 Toyota Tundra DC, 4.6L/6AT, 155k, ours 1999 Toyota Camry LE, 2.2L/4AT, 217k, his
https://shop.harborfreight.com/medi...25d08d6e5fb8d27136e95/i/m/image_8176.jpg Well, I got both front and rear wheels axles all cleaned up with a carbureter cleaner from Harbor Freight and wiped clean with a towel. I used "Super Lube" also from Harbor Freight. 3 ounces for $7 . It is a multi-purpose synthetic grease and has a NLGI on the listing.On their website it has a 120 reviews with a 5 star rating. Also on my "Diamondback" bike I did not need the cone spanner wrenches. One thing I do recommend is tag the parts that come off the left side and right side separate so you don`t mix them up.