SRP - Chainring & Crankbolts

SRP doesn't make an inner aluminum fixing bolt set. Therefore we got these from Kronos. The inner bolts have the standard 8mm by .75mm threads. These bolts have a 5mm hex fitting and are 15mm long. They are a direct replacement for any inner bolt set used in any of the cranks reviewed here. Coming as a set of five, these do not come with the needed 4mm spacers, so save the ones that come with the cranks. The set of five bolts weighs only 7 grams, far less than the steel set. Kronos anodizes the bolts in several colors, dark Blue, Black, Lavender, Red, Silver or Turquoise (light Blue).

Color-B-BK-L-R-S-T $ Price in Catalog

Machined from Titanium 6Al-4V rod, this set of five inner fixing bolts replaces the standard steel ones which come frequently with cranksets. The set has the standard 8mm by .75mm threads to fit all triple cranksets, and have a 5mm hex fixing for easy removal. The set of five can come in one of three lengths, a standard 12.5mm threaded bolt or a long version that is 16.5mm long. Neither set comes with aluminum spacers, you will need to save the ones that come with your cranks. The weight of the 12.5mm long set of five bolts is 9.5 grams, the longer 16.5mm set weighs 11.5 grams.

12.5mm standard, 16.5mm long, 10mm short $ Price in Catalog

This set of five aluminum fixing bolts replaces the standard steel ones that come with cranksets described above. The bolts are threaded to the standard 8mm by .75mm thread, with the threaded portion being 8mm long. The bolt head has a 5mm hex fitting. The nut portion is also made of aluminum with a slot cut in the back for a grip at time of removal. The threaded portion of the nut is 8.5mm long. The five bolts weigh 5 grams, while the five nuts weigh 4.5 grams, with a total set weight of 9.5 grams.

The bolt set is anodized in dark Blue, Black, Lavender, Red, Silver and Turquoise (light Blue). Made in Massachusetts.

Color-B-BK-L-R-S-T $ Price in Catalog

This set of five titanium fixing bolts and nuts replaces the standard steel ones that come with many cranksets. The bolts are threaded with the standard 8mm by .75mm threads. The threaded portion of the bolt is 8.5mm long. A question should arise about how Titanium can be used for both the nut and bolt pieces of this set without them "seizing" to each other as the bolt is threaded into the nut. The answer is the bolt pieces should be coated with an anti-seize compound. The bolt head has a 5mm hex fitting. The nuts are also made of titanium with a slot cut in the back for a grip at time of removal. The threaded portion of the nut 8.5mm long. The five bolts weigh 7 grams, while the five nuts weigh 6 grams, making a set weight of 13 grams. While aluminum nut and bolt sets have occasionally been known to "strip out," with serious pressure, during installation, Titanium bolt sets have known no such failure. Made in USA . $ Price in Catalog

This pair of crankbolts are the two that go through the crank arm into the bottom bracket spindle to fasten the arms. These bolts are direct replacements for every three piece crank bottom bracket having a 2 degree tapered spindle we sell. The bolt is threaded to the standard 8mm x 1mm thread pitch, and has a six sided 14mm bolt head on them. The useful threaded length of the bolt is 19mm and the bolts come with matching Titanium washers to evenly pull the aluminum arm onto the B/B spindle. The weight per pair, (with 20.5mm diameter washers), is 16 grams. $ Price in Catalog