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I'm having a hard time choosing a tire for my bike ('11 Yamaha FZ8n). The main source of my confusion are very similar markings on a multitude of tires that don't make a lot of sense to me. I was hoping someone could help me out a bit on this.

The manufacturer recommends the following tire for the bike:

Bridgestone Battlax 021 BB 180/55 ZR 17 (73W) TL

This tire, however, is not exactly competitively priced. There's a significantly less pricey Bridgestone alternate with the following designation:

Bridgestone Battlax 021 180/55 ZR 17 (73W) TL

The difference here is the intermediate BB in the designations.

What does that BB mean and what's the difference between the two tires?

EDIT:

As stated in the comments, it appears that the BB is nothing more than an original equipment code. All extra information I've been able to find on the tires is that the BB model is the "original equipment" for the Yamaha FZ8.

However, it'd be nice to know if there are any differences in the tires beyond their model code justifying a nearly 50 % price difference (~150 € and ~100 € for the rear tires respectively).

What is the technical difference between the two models?

share|improve this question
    
this not really an answer but from doing some online research it appears the BB may refer to it being an original equipment tire but apparently only for Bridgestone. –  mikes Jan 26 at 22:20
    
@mikes I eventually ran into that information myself. The tire is listed as the original equipment for my bike model. However, in the absence of any indications of actual technical differences between the two tire models I'm inclined towards saving some money and getting the cheaper tire that lacks the BB designation. –  Kallja Jan 27 at 6:24

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