Atom 77 Vintage 6 Speed 13-21 Freewheel

Atom 77 Vintage 6 Speed 13-21 FreewheelOriginal part in production from the 1970s to the 1980s Suitable for historic cycling events such as L'Eroica Professionally checked & carefully cleaned Worldwide shipping Atom 77 freewheel, hailing from France and in production from the 1970s to the 1980s. Made from steel and weighing in at 405 grams. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike too. If you're taking part in L'Eroica or a similar

✓ Original part - in production from the 1970s to the 1980s
✓ Suitable for historic cycling events such as L'Eroica
✓ Professionally checked & carefully cleaned
✓ Worldwide shipping

Atom 77 freewheel, hailing from France and in production from the 1970s to the 1980s. Made from steel and weighing in at 405 grams. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike too.

If you're taking part in L'Eroica or a similar vintage event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong freewheel!

The freewheel's been carefully cleaned, thoroughly checked by one of our mechanics and graded as good condition, but do take a good look at the detailed photos so you can see the cosmetic condition before you buy, and please consider that freewheels wear with chains, so used freewheels can occasionally skip when partnered with new (and some used) chains. This can usually be avoided by using a compatible used chain of similar age, but there is no way for us to confirm which chain will work with which freewheel.

OVERVIEW

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Condition - Good
Production Era - 1970s & 1980s
Country - French
Material - Steel
Weight - 405 g
Stock Code - U-FW50V

TECHNICAL INFO

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Speed - 6 Speed
Range - 13-21
Threading - English/ISO: 1.375 x 24 TPI
Stack Height - 33 mm
Chain Width - 3/32"

▼SHIPPING, TAXES & RETURNS

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We've been safely sending orders around the world since 2010. There's a handy shipping calculator on the shopping cart page so you can see the cost of postage as soon as you've added it to your basket. Your order will be carefully packed and sent with tracking & insurance, we despatch most orders within 2-3 days but larger items and orders placed before the weekend can take an extra day or two to process.

We accept returns, please notify us within 14 days and ensure the item arrives back with us no later than 30 days after the order was received.

EU Customers – for orders under €150 (excluding shipping), VAT will be collected at checkout, but from 1st July 2026, due to new EU import regulations, there may also be a customs duty payable to the carrier. For orders over €150, all import fees will be payable to the carrier, with nothing collected at checkout.

USA Customers – import fees are now collected at checkout for all orders to the US, so there won’t be any surprise charges when your order arrives.

Other International Customers – local import fees may still apply, charged by your customs office or courier before delivery. These are not collected by us, so please check your local rates before purchasing.

Any applicable fees will appear at checkout.

▼HELP SECTION

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Speed - the number of cogs on the freewheel.

Range - the number of teeth on the smalles and largest cogs, this gives you an indication of how hard or easy the gearing will be, the lower the number the harder the gears. The tooth count of the cogs inbetween are usually evenly spaced, ie: a 6 speed 14-24 freewheel would likely have cog sizes 14, 16, 18, 20, 22 & 24.

Threading - this needs to match the thread of your rear hub. ISO is the modern standard and is almost exactly the same as older English/British and Italian thread, allowing you to mix and match between these thread types as long as it's not going to be under extreme force, in which case it's best to stick to an exact match. Hubs with a French thread must be used with a French threaded freewheel.

Stack Height - the total height (or width if you're looking at it when installed) of the freewheel, this is measured from the base (back of the largest cog) to the top (front of the smallest cog).

Chain width - this is mainly relevant for singlespeed and some older 3 or 4 speed freewheels - if this is ⅛” then you must use a ⅛” chain, but most freewheels (especially multiple speed ones) will use a standard 3/32” chain.