Definitely get the Black Chilli version whichever tyre you decide on – as someone has said, price is usually a good indicator but also check the Continental website: here. The Conti website gives a product code for each tyre, its weight, construction and ERTO number and also shows whether the tyre is Black Chilli or not. Using this info and advertised tyres’ price and description online, you can usually work out which tyre you’re looking at.
I’m not running a UST Conti but I’ve got a tubed Rubber Queen 2.2 BC up front and Mountain King Mk II Protection 2.2 BC out back. The Mountain King measures exactly 2.1″ wide so comes up narrower than advertised. In terms of performance, it isn’t anywhere near the Rubber Queen for grip – I won’t buy another Mountain King based on my experience. If you can fit the Rubber Queen 2.2 I’d definitely recommend that – will be putting a pair on my new build without hesitation – UST on the back. For info, the Rubber Queen 2.2 measures exactly 2.2″ wide but is 5 mm taller than a ‘normal’ tyre.
Purchased my Conti tyres from Bike-discount.de – excellent service, price and quick delivery. I haven’t used Next Day Tyres but have read very good reports of their service – price will be more than some online retailers but if you’re confused about which tyre is which, their website is very clear so you’ll definitely know which tyre you’re buying.
Hope this helps.
Stu