If you're riding mainly in UK then a good rain tire should be considered.
You may be limited in choice with "road only" tires in your size range (21" front, 17" rear)
I would NOT go with a too wide rear tire. (bad idea for number of reasons) The very best tires for that bike are the various and excellent road biased dual sport tires:
In terms of longevity and performance, both wet and dry, it's very hard to beat the Metzeler Tourance. Expensive, yes, and it IS a road biased dual sport tire, but it will out last and out perform most all road tires you can find that fit that bike.
Excellent tire .... and will out perform ALL road tires in the rain.
(very wide and deep sipes on tread work better than road tires)
Also consider:
Avon Distanzia
Shinko E705
Michelin Anakee
Pirelli MT90 Scorpion
All similar to Tourance but none will last as long. All are good in wet and offer super sticky side grip in sporty riding at the limit. I've used them ALL on my DR650 (2), XR650L, Triumph Tiger (2) and DL1000 Vstrom (2). 250K miles in total.
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