Simplex 3649 A Vintage 24-30 mm Seatpost Binder Bolt

Simplex 3649 A Vintage 24-30 mm Seatpost Binder BoltOriginal part in production from the 1970s to the 1980s Suitable for historic cycling events such as L'Eroica Checked & cleaned Worldwide shipping Simplex 3649 A seat post binder bolt (or seat pin clamp bolt if you prefer), hailing from France and in production from the 1970s to the 1980s. Made from steel and weighing in at 10 grams. A fine choice for keeping your vintage bike authentic, but also great for any other compatible bike. If you're taking

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

Simplex 3649 A seat post binder bolt (or seat pin clamp bolt if you prefer), hailing from France and in production from the 1970s to the 1980s. Made from steel and weighing in at 10 grams. 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 any other vintage event, this is fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong seatpost binder bolt!

The seatpost binder bolt's been cleaned, checked 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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Condition - Good
Model ID - 3649 A
Production Era - 1970s & 1980s
Country - French
Material - Steel
Weight - 10 g
Stock Code - U-G3-SBB32V

TECHNICAL INFO

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Clamp Opening (Min-Max) - 24-30 mm
Outer Diameter - 8 mm
Bolt Fixing Type - Allen Key (Single Side with Nutted End)

▼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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Clamp Opening - the minimum and maximum distance between the inside of the nut and bolt heads. The minimum is measured with the bolt tightened as much as possible (for hex head types this may mean the bolt end will stick quite far out of the nut). For the maximum opening we ensure 5-6 mm of thread remainis in the nut for a secure fixing.

Outer Diameter - the part that goes through the frame, most steel frames will take an 8 mm bolt whereas early lugged aluminium frames often have a larger hole that takes a 10 mm bolt diameter.

Bolt Fixing Type - some binder bolts have tightening mechanisms on both sides to secure the seatpost in the frame. Single sided bolts need something else to help; some have knurled parts that grip the inside of the bolt hole, others have a small notched 'key' locator that lines up with a cut-out in the frame (if you have one).