South Salem Cycleworks: Salem, Oregon
(503) 480-2001
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116mm Bolt Circle Diameter, 5-Bolt chainrings

116mm Bolt Circle Diameter (BCD), 5-Bolt chainrings on this page:
Campagnolo: 42-tooth 3-Arm | 52-tooth 3-Arm
40-tooth | 52-tooth

Back to master list of available chainrings

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116mm BCD chainrings fit:

  • Campagnolo Nuovo Gran Sport double & triple (made in the late 1970s until about 1985 and came in the Green "Gruppo Gran Sport" box)
  • Victory (1985 - 1988)
  • Triumph (1985 - 1988)

The smallest ring that can be made with a 116mm bolt circle diameter is 35-teeth.

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.

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

Campagnolo Gran Sport 3-Arm 42-tooth chainring with crack at one fixing bolt hole. Used, $45.00/each

Campagnolo chainring

The fixing bolt hole with a crack is at about 5:00

Campagnolo chainring

Here's the other side of the ring.

Campagnolo Gran Sport chainring

Here's what it looked like mounted on a crank arm.

Campagnolo Gran Sport chainring

Just so there's no mistake.

Campagnolo Gran Sport 3-Arm 52-tooth chainring. Used, $65.00/each

Campagnolo Gran sport chainring

This is truly a rare bicycle part.

Campagnolo Gran Sport chain ring

The other side of the ring.

Campagnolo Gran Sport Chain Ring

Straight on view

Campagnolo chainring

Here's the ring mounted on a crankset.

SR Apex-5 40-tooth 116 BCD chainring. Used, $30.00/each

SR Apex 40-tooth chainring

Works on several 1980s Campagnolo cranksets

SR Apex 40-tooth chainring

Here's the other side of the ring

SR Apex-5 52-tooth 116 BCD chainring. Used, $45.00/each

This ring is drilled and tapped for an SR alloy chainguard. That's what those five small threaded holes on the ring's perimeter are for.

SR Apex 52-tooth chainring

Front side

SR chainring

The back side

SR Apex chairing

Close-up showing that it is an Apex-5 ring as well as the amount of wear on the teeth.