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All about bolts27/04/2002
All about bolts (Author: Nino)
M5 x 6 means:M5 is the size of the thread in millimeters: here it`s 5 millimeters of outside diameters.
6 refers to the length of the thread in millimeters: here it is 6 millimeters.
So M6 x 15 for example means a 6 millimeter diameter thread which is 15 millimeters long.
BOLT TUNING:
| Aluminium | Titanium | ||
| Chainring bolts | − 30 g | − 15 g | 2x5 pcs |
| − 24 g | − 12 g | 2x4 pcs | |
| Crank fixing bolts | − 15 g | − 10 g | |
| F-derailer | − 5 g | − 2 g | 2 main bolts |
| R-derailer | − 10 g (ca.) | − 4 g (ca.) | hanger bolt, cable stop bolt, pulley wheel bolts |
| A-head cap bolt | − 4 g | − 2 g | M6x20 mm |
| Bottlecage bolts | − 7 g | − 4 g | 4 pcs M5x10 mm (Al = 3 g / Ti = 6 g / Steel = 10 g) |
| Brake lever bolts | − 5 g | ||
| Canti brake bosses on frame | − 8 g | 2 pcs (typical steel bosses weigh around 24 g) | |
| Canti brake bosses on frame | − 6 g | 2 pcs (Manitou Ti: 12 g / RockShox SID steel: 18 g / Manitou steel: 21 g) | |
| Stem | − 5-10 g | 4-6 pcs | |
| Seatpost | − 3-8 g (ca.) | 1-2 pcs | |
| V-Brake canti bolts | − 11 g | − 6 g | 4 pcs M6x15 mm |
| V-Brake cable fixing bolts | − 5 g | − 3 g | 2 pcs M5 or M6x8 mm |
| V-Brake brakepad fixing nuts | − 10 g | 4 pcs M6 | |
| V-Brake brakepad carrier bolts | − 8 g | 4 pcs (Ti = 12 g / Steel = 20 g) | |
| Ti bolt-on axles instead of QR | − 70 g | typical steel QR levers 120 g, bolt-on axles Ti = 48 g / steel 65 g | |
| Cassette Lockring | − 10 g | Steel 14 g / Al 4 g | |
| Pedals | − 10 g | my Corratecs had 8 steel bolts | |
| Pedal axles | − 70 g |
The only place you need the added strength of Titanium is at the stem and the seatpost.
All other bolts can be out of Aluminium which is also a lot cheaper than Ti.
Carbon (savings over aluminium):
| A-head spacer | − 6 g / 10 mm | (Al = 10 g / 10 mm , Carbon = 4 g / 10 mm) |
V-BRAKE TUNING:
| CrMo | Ti | Al | Max. saving | |
| 4 Canti-bolts M6x15 mm | 16 g | 10 g | 5 g | − 11 g (Al) |
| 4 padcarrier bolts | 20 g | 12 g | − 8 g (Ti) | |
| 4 pad fixing nuts M6 | 14 g | 9 g | 4 g | − 10 g (Al) |
| 2 Cable fixing bolts M6x8 mm (Avid) | 8 g | 5 g | 3 g | − 5 g (Al) |
| Total possible savings: | − 34 g | |||
Example for maximum possible BOLT-TUNING on a MTB:
ALUMINIUM:
Chainring bolts (2x5pcs) -30 g / (2x4 pcs) –24 g
Crank fixing bolts -15 g
F-derailer (2 main bolts) -5 g
R-derailer (hanger bolt, cable stop bolt, pulley wheel bolts) ca. -10 g
A-head cap bolt (M6x20 mm) -4 g
Bottlecage bolts (4 pcs M5x10 mm) –7 g ( Al = 3 g / Ti = 6 g / Steel = 10 g)
Brake lever bolts –5 g
V-Brake canti bolts (4 pcs M6x15 mm) –11 g
V-Brake cable fixing bolts (2 pcs M5 or M6x8 mm) –5 g
V-Brake brakepad fixing nuts (4 pcs M6) –10 g
Cassette Lockring –10g (steel 14 g / Al 4 g)
TITANIUM:
Seatpost clamp bolt –3 g
Canti brake bosses on frame (2 pcs.) : -8 g
Canti brake bosses on fork (2 pcs) -6 g
V-Brake brakepad carrier bolts (4pcs) -8 g
Stem (4-6 pcs) 5-10 g
Seatpost (1-2pcs) ca. 3-8 g
Total possible savings: ca. 150 g
Remember:
Titanium is about 1/3 lighter than steel.
Aluminium is 1/3 the weight of steel and ½ the weight of Titanium.
Carbon is about ½ the weight of aluminium
