Mountain Biking - Do I need a new crankarm and bb?

My goal is to transform my 24spd (3x8) into an 8spd (1x8) + RaceFace Bash Ring. (http://www.pricepoint.com/images/styleImages/D_100%20RACBG2.jpg).

I bought a BlackSpire Mono Veloce chainring (http://www.pricepoint.com/images/styleImages/Z_080%20BLAMV5.jpg) for my single ring.

The current crankset that I have is the stock Truvativ X-Forge (http://www.bikeforums.net/attachment.php?attachmentid=27661).

Now, my confusion is the lining up of the holes for the ring, bahguard and crankarm. Um, they dont match! The BlackSpire ring and RaceFace bash guard have matching holes but I dont know how they will attach to my current crank arm.

I wont be keeping any of my current rings so how is the crank arm going to attach to the new ring and the new bash guard??? :confused:

Simple answer it won't. The bolt circle holes have to match. What you could do is Dremel the teeth off the big ring into a bash guard as you save for a properly matched crankset

Simple answer it won't. The bolt circle holes have to match. What you could do is Dremel the teeth off the big ring into a bash guard as you save for a properly matched crankset

Yeah, after staring at it for hours yesterday I realized that it wont work. So what exactly does BCD mean? I know of the different sizes and it looks like mine is 104.

I think I need to get a new BB and crankset if I want this single ring setup to work. Apparantly square-tapered BB's and my style rings are outdated.

The two parts that I already have are the BlackSpire Mono Veloce ring (http://www.pricepoint.com/detail/13874-080_BLAMV5-3-Parts-52-Chainrings/Blackspire-Mono-Veloce-Single-Speed-Chainrings.htm) and the RaceFace Bash Guard. (http://www.pricepoint.com/detail/11231-100_RACBG2-3-Parts-52-Chainrings/Race-Face-Bash-Ring-.htm)

Before I get a new crankset and BB I want to make sure that all four parts will work together. The crankset is going to be the FSA X-Drive (http://www.pricepoint.com/detail.htm?stylePkey=13006&style_id=100%20FSAXA4) and the BB is gong to be the RaceFace SRX. (http://www.pricepoint.com/detail.htm?stylePkey=11056&style_id=030%20RACSR2). Both are ISIS splined which Im assuming is the only thing that I need to match up?

http://www.sheldonbrown.com/gloss_bo-z.html

BCD as described by sheldon brown.

http://www.sheldonbrown.com/gloss_bo-z.html

BCD as described by sheldon brown.

Thx.

So is ISIS Drive the same as ISIS Splined?

I believe so.

Last question...does it matter what size ring bolts I get? Since Ill have just the one ring and the bash guard, will 9mm bolts be long enough?

Something like this:

http://www.jensonusa.com/store/product/CG707Z00-Outer+Steel+Chainring+Bolts.aspx

Standard sized bolts should work. Try asking in the mechanics forum, might get more hits.