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For rough work I use METABO grinding wheels 60 grit and NORTON 100 grit. The METABO grinding wheels are available in 10 "sizes. Recommend.

Thanks Arthur, could you provide the part number for the Metabo? Anytime I start looking at abrasives I get lost in all the details ( type, grit, hardness, etc)
I just ordered a Norton 3X based on advise from here but it is only 8".

I'd like to know what the good 10" option is.

Thanks Rick and Ken.

Rick, there are a couple of topics here, I want to be sure I understand:
- Did you say that the Norton and No-Name wheel were better than the stock SG250 for fast material removal?
- 80 CBN or the Norton or the No-Name is good to use right before the SG250, it is an acceptable progression of grits?
- The  8" CBN's on a bench grinder is better than the 10" Norton and No-Name for fast material removal?

Please tell me if the above is incorrect, I'm trying to understand, not put words in your mouth!

In the end though I would like to get faster material removal on my Tormek.
(I'd prefer that to a belt or bench grinder,) so I'm trying to figure it out. I'm trying to figure out : Stone or CBN or Diamond, and if so, which one?

Could you give some more specs or sources on the Norton and N-Name? Mounted on the Tormek, Correct? (mounting isn't an issue for me, I'm a machinist)

......fast metal removal wheel was a traditional grindstone mounted on my T8.  Even though only 1" wide, it works quite well and at under $100 is quite affordable.  .........
......The first traditional grindstone I used was a Norton 3X 84 grit but I now have a 10" dia. "no-name" one that was my go-to before getting the CBN wheels. 

While I've only just started using the CBN wheels,....  ....the  6" or 8" 4-in-1 PLUS CBN Wheel.......... I have the 8", 80 grit one. ...

cbwx34, RickKrung, Ken S, Thank you for your well considered replies.

I am new to sharpening and don't have a belt machine or experience in freehand sharpening yet. So I think for now belts are not an option.

Ken S: At the moment I am doing mostly medium quality home kitchen knives, so not hard and exotic materials. It seems that is mostly the benefit of the SB250? Or is the SB250 faster on standard Stainless Steel than the SG250?

So from your three answers it seems that the diamond wheels are my preferred choice at the moment.

I will look at the YouTube recording of the Tormek live session.

I find that it takes a very long time to do anything more than modest regrinding the apex of a knife.

If I have to change the overall curve of a knife edge it takes very long.
Also after I use my bench grinder to grind off the part of a solid bolster left behind from many previous grinds( the swale), then it also takes a long time to reshape the curve of the edge.

So I think a coarser grit wheel would be faster?
Are the diamond wheel the only option or are there stone wheel that are appropriate?