BSA M20 & M21

World's Greatest Sidevalves T-shirt






This one was our first T-shirt.  That's because we run an M20 and we wanted to pay some kind of homage to a bike that's given us a lot of fun and carried us around Britain and France for thousands of miles.


So okay, not everyone will agree that this is the "World's Greatest Sidevalve". But hey, we stand by it. These bikes were built before the war, during the war, and post-war. The British army alone took almost 125,000 machines. Today, countless thousands of all types are still in service worldwide, and there are new old bikes being discovered all the time. We can't think of a sidevalve that's better known, better served, and better loved.

If you're into BSA M20s and BSA M21s, this T-shirt was created for you. It looks good when you're off the bike, and it looks better when you're on it.

But if you just enjoy classy classic motorcycle tees, this one will put some fresh colour in your life. Currently, it's our most popular design. Click the image to the right for a more detailed view.





Price: 19.99
P&P: UK 4.95. EU 7.00. Worldwide 11.00.
Colour: Black only
Sizes (chest):
Extra extra large: 50 inches or 126 cm
Extra large: 46 inches or 117 cm
Large: 44 inches or 112 cm
Medium: 41 inches or 104 cm
Small: 35 inches or 89 cm


Take note too that we don't sell, trade, barter, or give away your private data. It's used for us alone. So trust us, or don't trust us. Only Sump and your undertaker will ever know how fat you really are.

We usually despatch next day, but public holidays and heavy ordering issues will inevitably slow us down a little. Here's the ordering box ...


UK Delivery




BSA M20 & M21 T-shirt

Price: 19.99

P&P: 4.95

Sizes: XL, L, M, S

Enter T-shirt size(s)



BSA M20 & M21 T-shirt

Price: 19.99

P&P: 7.00

Sizes: XL, L, M, S

Enter T-shirt size(s)



BSA M20 & M21 T-shirt

Price: 19.99

P&P: 11.00

Sizes: XL, L, M, S

Enter T-shirt size(s)



Pay with Paypal. No account is necessary. Just use your credit or debit card. It's safe, and easy.


Special note: Customers tell us that Paypal can be a little slow loading lately. We've slapped their wrists over it, but keep it in mind if you have problems. You can try reloading the page, or email us for assistance. It shouldn't be necessary, but who can figure the subtle machinations of the internet?


Not us.



Sump buyers say...


"Shirt arrived. Looks great. Great colors!"

Kevin Seiler, Chatsworth, California

"Received my T-shirt today, shipped to the Netherlands. Great T-shirt. The fit is spot on. I am very pleased with it."

Ramon Berlauwt, Oosterbeek, Netherlands

"Just letting you know that I received my t-shirt today and am very happy with it. Thank you very much."

Michael & Jacqueline Dyer, Perth, Western Australia.

"Bought one. Thanks."

Jeff Robbins, Valencia, California










Legal stuff

All Sump T-shirt designs are produced entirely by us right here in Sumpland. We're not claiming any connection with any other group, organisation, company, manufacturer, institution, body, retailer or fly-by-night-merchant. Sump T-shirts are not available anywhere else unless they're being pirated. If you've got any copyright concerns, disputes, threats or similar, fire off an email and we'll look into it when we next sober up.



We only sell tees we
wear and enjoy. If you have a problem with anything you buy
from us, tell us and we'll sort it out. Pronto. No fuss. No arguments.

And if you change your mind within 30 days, just return it unworn
for a refund.

Grab yours now!






classic bike T-shirt



P&P: UK 4.95

EU: 7.00

Worldwide: 11.00
Colour: Olive drab

BSA M20:
It's not just the bike.
It's the journey
classic bike T-shirt



BSA M20 T-shirt for classic bikers



P&P: UK 3.00

EU: 5.00

Worldwide: 6.00
Colour: Black



Copyright Sump Publishing 2016