Tiger Sport 800

It could be that with the multiple Honda 750 and Suzuki 800 twins now on the market Triumph wanted to appear to be in that size range more. The 660 and 900s possibly sounding that bit smaller/bigger putting some people off, even if only psychologically.

 

I also think the Tiger moniker has got a bit lost and confused over the years ie first models were light adventure, then they were road bikes marketed as adventure bikes, then full on adventure models. At least the later road going models are branded Tiger Sports, so that ppl get a inkling of the intended usage.