Polygon 590 SQ NOS Vintage Front Brake Caliper

✓ Original part - produced in the 1980s
✓ New old stock! Still unused after all these years
✓ Lightweight for the era - just 172 grams
✓ Suitable for historic cycling events such as L'Eroica
✓ Worldwide shipping

Polygon 590 SQ brake caliper, hailing from Taiwan and in production during the 1980s (yet still new & unused after all this time!). Made from aluminium and weighing in at 172 grams - pretty lightweight for a brake caliper at that time. 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, these are fully compliant - so rest assured, the pre-1987 police won't lock you up for having the wrong brake!


Condition - New Old Stock*
Production Era - 1980s
Country - Taiwanese
Material - Aluminium
Weight - 172 g
Stock Code - D-CPS16V

*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.


Position - Front
Caliper Type - Single Pivot (Side Pull)
Brake Drop - 45 mm - 55 mm
Brake Fixing - External Hex Nut


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.

We don't charge VAT, however, if buying from outside of the UK please remember that there may be import fees to pay directly to the delivery company before receiving the order. Unfortunately we can’t advise on the exact costs as it varies from country to country, so please check your national rates before purchasing.


Position - this determines whether the brake is designed to be used on the front or rear wheel of the bike.

Caliper Type - side pull calipers (single or dual pivot) require nothing more than a brake hole to fix them to as the cable feeds straight into one of the arms, whereas centre pull calipers require a brazed-on or fitted cable hanger to allow the cable to be pulled from the centre.

Brake Drop - measured from the centre of the brake mounting hole to the centre of the wheel rim, measured in a straight line. Your measurement must be within the range of the caliper's given brake drop.

Brake Fixing - this refers to the way the brake is secured to the bike. For recessed allen key fixings the hole to the rear of the the fork crown/brake bridge should measure around 8mm, allowing the allen key head to be inserted and fixed to the brake bolt. External hex nut fixings require a hole of around 6mm, the hex nut is fixed to the protruding part of the brake bolt.

For a more detailed guide on getting the right brakes check out our journal.