How can it take so long to make a bolt? If we’d been happy for the production ones to be machined from bar stock like the prototypes (and to be similarly expensive) then it would have been a lot quicker, but instead we decided to invest the time and effort to make a forging tool to give the part a better grain structure and to get the price down. So here they finally are.

G-Sport Volcano Bolts:
» 3/8″ diameter
» 24 threads per inch
» 6mm allen key socket
» 24mm diameter “volcano” head.
» Recommended tightening torque, 35N-m.
» Maximum tightening torque, 50N-m.
» Minimum tightening torque, 20N-m.

The shank is one inch, or 25.4mm long, and the top 5mm are left unthreaded to optimize the fit in the dropout. This design will still fit a 3mm dropout thickness with the Marmoset Hub because the axle threads are inset 3mm to help locate the bolt and minimize the risk of cross-threading. The head is 7.5mm tall, giving the bolt a total overall length of 33mm.

The weight is 25.8g or 0.9oz each, compared to 35.6g or 1.25oz for the regular 35mm long shank, 17mm hex-head Marmoset bolt. So a pair will save you less than an ounce (which unsurprisingly, isn’t what they are intended for).

To be clear, these bolts are NOT designed for use with pegs. Check the condition (and size) of your Allen key before tightening. Rounded keys will damage the hex, and eventually removal will become difficult. Do not force damaged bolts into the hub axles. You will damage the axle threads and/or helicoil.

Volcano Bolts are compatible with many female axle hubs, here’s a brief list:
» G-Sport Marmoset – YES
» G-Sport Monkey – YES
» G-Sport Fat Shaft MkII – YES
» G-Sport Fat Shaft (1995 onwards) – YES
» Odyssey Vandero 2 – YES
» Demolition Mary-Kate front – YES
» Shadow Raptor Front – YES
» Colony Clone Front – YES

And hubs they WON’T fit:
» G-Sport Fat Shaft (1994 -1995) – NO (M10x1.0)
» Profile Mini Front – NO (3/8x16T)
» Madera Pilot Front – NO (3/8x16tpi)
» Fly Bikes Front – NO (M10x1.0)
» Eclat Teck front – NO (M10x1.0)
» WTP Supreme Front – NO (M10x1.0)