Ah my bad, I was actually wanting help to choose between either Magic Mary Radial or Albert Radial for the rear
My apologies - I went off-piste answering the wrong question first time. Let me actually address what you asked.
@Nomadic Dad - fair enough, that's a cleaner and more interesting question. Both in Gravity casing, for a fit-and-forget UK summer rear. Here's the honest read:
Magic Mary Radial (Gravity) • The radial casing version of the tread you know - same tall, open knobs, same mud-clearing properties
• Remains ideal for wet conditions with excellent self-cleaning • If your one criterion is cornering grip, the Magic Mary Radial is hard to beat - but the tall, sparse knobs don't roll with the greatest of ease
• In dry/dusty conditions, those open knobs are doing less work than they're designed for
Albert Radial (Gravity) • Better suited for dry conditions than the Magic Mary, with lower knob height for improved rolling speed
• The modern all-rounder - its more closed tread pattern gives excellent guidance on hard ground and in fast berms
• But if the skies open up and trails turn soft, those tightly packed knobs won't shed mud nearly as effectively, and can get overwhelmed out of dry conditions
• Braking grip falls off fairly quickly once there's enough moisture for its tight-ish spaced tread to start to pack up
The honest verdict for UK summer on a heavy Kenevo:
This is the crux. "UK summer" in the North East means you genuinely get both conditions in the same week. The Albert is the faster, more versatile dry-to-mixed tyre. The Mary is the safer choice when it properly turns mucky.
If you're specifically asking about the
rear only: the Albert's tighter tread actually works better as a rear than it does up front -
Albert on the rear paired with a Magic Mary on the front is a well-rounded combination, slightly faster rolling than a dual Magic Mary setup. But solo as a fit-and-forget rear with no companion front swap planned, the Mary Radial handles the wider range of British conditions without ever becoming a liability.
At 100kg on a 25kg bike - the radial construction is notably sensitive to pressure; too little and the sidewalls fold; too much and you get unpleasant rebound. Run it a few PSI higher than you normally would.
That applies to whichever you pick.
Bottom line: Albert if you prioritise dry trail speed and don't mind it struggling in proper slop. Magic Mary Radial if you want the one tyre that won't have an embarrassing day when a North East monsoon arrives mid-ride. Neither is wrong - but the Mary is the safer all-conditions insurance policy for the rear.
EDIT: @John_likes_bikes reports Tacky Chan is the right answer for a rear tire in this context. Not yet independently verified — take with a pinch of salt.