Zeus Gran Sport (13100.00) Vintage 170 mm Road Chainset

Zeus Gran Sport (13100.00) Vintage 170 mm Road ChainsetOriginal part produced in the 1970s Suitable for historic cycling events such as L'Eroica Professionally checked & cleaned Worldwide shipping Zeus Gran Sport chainset (or crankset, if you prefer), hailing from Spain and in production during the 1970s. Made from aluminium and weighing in at 613 grams pretty lightweight for a chainset at that time. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike. If

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

Zeus Gran Sport chainset (or crankset, if you prefer), hailing from Spain and in production during the 1970s. Made from aluminium and weighing in at 613 grams - pretty lightweight for a chainset at that time. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike.

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 chainset!

The chainset'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.

OVERVIEW

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Body Condition - Good
Chainring Condition - Good
Model ID - 13100.00
Production Era - 1970s
Country - Spanish
Material - Aluminium
Weight - 613 g
Stock Code - U-G3-CS147V

TECHNICAL INFO

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Chainring Count - Double
Tooth Count - 53 / 42
Bottom Bracket Type - Square Taper
BCD - 118 BCD
Crank Arm Length - 170 mm
Chain Width - 3/32" (Standard)
Pedal Threads - Standard (9/16" x 20 TPI)
Intended Speed* - 5 Speed, 6 Speed, 7 Speed
Bike Type* - Road

*See help section.

▼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.

▼SAFETY & COMPLIANCE

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This product complies with the EU General Product Safety Regulation (GPSR). Professional installation and regular inspections are recommended. Due to the product's age, extra care should be taken during use.

EU Authorised Representative - Global Trade Department NI Ltd, Office 834, Unit 6, 100 Lisburn Road, Belfast BT9 6AG, Northern Ireland

▼HELP SECTION

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Chainring Count - the number of chainrings on the chainset. Fixed gear track bikes, single-speeds and some geared bikes use a single chainring, road bikes commonly use a double (two rings) and most touring bikes and mountain bikes will use a triple chainset (three rings).

Tooth Count - the number of teeth on the chainring(s), the higher the number the harder the gear.

Bottom Bracket Type - ‘square taper’, as the name suggests have a square shaped axle that slots into the chainset and ‘cottered’ axles are round and secured by pins - pretty much every bike up until the 1990s would use one of these, cottered being the much earlier system. Since then, different manufacturers have introduced their own systems that are not interchangeable so you must use a chainset that matches.

BCD - stands for Bolt Circle Diameter (sometimes referred to as PCD - Pitch Circle Diameter) and is only really needed when changing chainrings. To calculate the BCD, measure the distance in millimeters from the centre of any chainring bolt to the centre of an adjacent one and multiply it by 1.709 (you’ll likely need to round the resulting number up or down a little to get your BCD measurement).

Crank Arm Length - this is measured from the absolute centre of the bottom bracket hole to the centre of the hole for the pedal.

Chain Width - this is mostly only relevant for chainsets with a single chainring - if this is ⅛” then you must use a ⅛” chain. Almost all double and triple (and some single) ring chainsets will use a standard 3/32” chain, the only exception being old chainsets designed for 3 or 4 speed freewheels.

Pedal Threads - this must match the thread of your pedals and is usually stamped on the pedals themselves, most bikes use a standard thread of 9/16” x 20 tpi. The exceptions being older French bikes, bikes with cheaper one-piece type chainsets and Shimano’s Dyna Drive system (easily identifiable as the pedal holes are about an inch wide!).

*Intended Speed - the number of cogs at the back the chainset was designed to be used with. We refer to it as ‘intended’ speed as most double and triple chainsets will actually work with different speeds than originally intended, but the further away you get from the intended speed the more likely you are to experience minor setup issues. The exception being some chainsets intended for 10 speed use or higher, with these it’s better to stick to the intended speed.

*Bike Type - this is just a guide, any chainset can technically be used on any bike as long as everything's compatible.

*Matching Bottom Bracket(s) - if known, based on standard rear spacing of the period. For square tapers, ISO and JIS standards were introduced in the early 1990s; earlier cranks were designed to fit the proprietary taper. Alternatives can achieve the same chainline and clearance if the axle has the same taper and dimensions, and sticking to the same manufacturer and era will help. Mixing tapers is not recommended, as it can damage the cranks.

NB: “ITA” refers to Italian-threaded frames (70 mm BB shell).