Shimano Dura-Ace (GB-100) 1st Gen NOS Vintage English 112 mm Bottom Bracket

Shimano Dura-Ace (GB-100) 1st Gen NOS Vintage English 112 mm Bottom BracketOriginal part in production from the 1980s to the 1990s New old stock! Still unused after all these years Lightweight for the era just 295 grams Worldwide shipping Shimano Dura Ace bottom bracket, hailing from Japan and in production from the 1980s to the 1990s (yet still new & unused after all this time!). Made from steel and weighing in at 295 grams pretty lightweight for a bottom bracket at that time. A fine choice for keeping your vintage bike

✓ Original part - in production from the 1980s to the 1990s
✓ New old stock! Still unused after all these years
✓ Lightweight for the era - just 295 grams
✓ Worldwide shipping

Shimano Dura-Ace bottom bracket, hailing from Japan and in production from the 1980s to the 1990s (yet still new & unused after all this time!). Made from steel and weighing in at 295 grams - pretty lightweight for a bottom bracket at that time. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike.

The very first Dura-Ace bottom bracket axles were stamped '333' with a date code that is specific to early Dura-Ace. The axles came with the GA-100 chainset but the specification remained the same when the FC-7110 chainset was introduced, so they are compatible with both models.

OVERVIEW

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Bearing / Race Condition - New Old Stock*
Model ID - GB-100
Production Era - 1980s & 1990s
Country - Japanese
Material - Steel
Weight - 295 g
Stock Code - D-BB126V

*New old stock items may have marks from storage over the years, and as we often have multiples they can vary from piece to piece, but they are always genuine new & unused items.

TECHNICAL INFO

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Thread Type - English Thread (British/ISO 1.37" x 24 TPI)
Axle Length - 112 mm
Axle Type - Square Taper

▼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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Thread Type - this must match the bottom bracket thread on your frame. The 3 common thread types on classic and vintage bikes are English (also known as British or ISO), Italian & French, and are usually (not always!) found on frames built in their respective countries. If you're replacing a bottom bracket the cups should have the thread type stamped on one of them, if not there are a couple of things to look at; bottom bracket shell width (English & French = 68 mm, Italian = 70 mm) & drive side cup thread direction (English = left, Italian & French = right). The only curveball to watch out for here, although pretty uncommon, are Swiss threads (also found on some French frames, Motobecanes being one) which will have the same shell width & thread direction as an English thread frame but the actual thread pitch will be different. If none of the above matches what you have, there are a few lesser known varieties that will require some further research.

Axle Length - your crankset dictates the axle length you need and the recommendation should be used to avoid issues with chainline. If you're replacing a bottom bracket that works perfectly then this can be matched, otherwise you'll need to check the manufacturers spec, a good resource for older bikes is Velobase.

Axle Type - you can tell which type of axle you need by looking at the shape of the bottom bracket hole in your crankset. For square tapers, the ISO introduced a standard for European makers in the early 90s, JIS then did the same in Asia. Before then it was not so simple, and although there is a degree of interchangeability, the best way to make sure you have the right axle is to stick to the same brand from the same era, ideally the proprietary model.