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(503) 480-2001
email: sscycleworks@comcast.net
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135mm Bolt Circle Diameter (Campagnolo) chainrings

135 Bolt Circle Diameter (BCD) chainrings on this page: 53-tooth red | 39-tooth green

Back to master list of available chainrings

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Bolt Circle Diameter is the diameter of the circle formed by the centers of the chainring fixing bolts. With 4-bolt cranksets, this is easy to measure. 5-bolt cranks are more difficult. Modern Campagnolo standard cranksets have a 135mm bolt pattern with 74mm for inner triple rings.

If you are unsure about what size chainring you need, Wolf Tooth Components has an excellent guide to measuring your rings.


Stronglight-produced 53-tooth red Italian Limited Edition chainring for 9/10 speeds. New, $150.00

Part# 62240-53

  • We have 6 in stock.
  • 7075 high-strength alumunum
  • Made for 9/10 speed systems

When Torelli produced a few limited edition Italian flag (red/white/green) anniversary framesets, the Stronglight crankset company offered to make special chainrings to complement the bikes. Of course, these chainrings will go with any bike that would be enhanced with these striking, beautifully-made rings.

Stronglight 53 chainring

You can see that Stronglight went out of its way to machine these rings to really stand out.

Stronglight chainring 53

Here's the back of the ring. You can see the pins to help lift the chain up on to the big ring.


Stronglight-produced 39-tooth green Italian Limited Edition inner chainring for 9/10 speeds. New, $125.00

Part# 62240-39

  • We have 6 in stock.
  • 7075 high-strength alumunum
  • Made for 9/10-speed systems

When Torelli produced a few limited edition Italian flag (red/white/green) anniversary framesets, the Stronglight crankset company offered to make special chainrings to complement the bikes. Of course, these chainrings will go with any bike that would be enhanced with these striking, beautifully-made rings.

Stronglight chainring

Ready to make your bike look special

39 tooth ring

The back side