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Cat3

Tire Pressure Isn't What You Think – 29er And 650 Wheels In Stock.

In cycling, there are a number of things that don't seem to make sense.  Spoke tension is one of them.  With stainless steel spokes, wheel stiffness isn't dependent on spoke tension.  A very high tension spoke is equal in stiffness to one with only a minor amount of tension.  It's the nature of the steel that determines tension.

Tire pressure is another one.  What we really care about is casing tension – how "hard” is the tire.  We all know cars have relatively low tire pressures (25-30 psi) but they support a car.  Most people don't make the mental leap to understand how that works on their bicycle wheels, and understandably so.  It's never mentioned that casing tension is important, nor any mention of what it is or how it's measured.  So we use the saying "Hard enough so you don't get pinch flats.”  There is nothing wrong with that except it doesn't give you an understanding of what is going on.

The new trend toward wider rims and bigger tires has brought this to the forefront.  The wider rim gives more air volume and therefore affects tire pressure.  The key component to this understanding is that casing tension is very much affected by air volume.  Here's a great link to the detail.

In the chart below, the casing tension is equal. So, if you were running a 23 mm tire and switched to a 25, you would go from 104 psi to 96 and still get the same casing tension.  Since there is more air volume, you can go down even more in pressure without getting pinch flats. Lower pressures give you more rubber on the road – better traction, a more comfortable ride, and better performance – the sidewalls flex over bumps. So if you put a bigger tire on make sure to reduce the tire pressure.

Tire Size	PSI
20	120
21	114
22	109
23	104
24	100
25	96
26	92
27	89
28	86
29	83
30	80

2013 supersix non-hi mod carbon

2013 Cannondale SuperSix carbon, non-hi mod,  weight 1050 grams = 2.31 lbs
2013 Cannondale SuperSix Hi-Mod, weight 700 grams = 1.54 lbs

• SuperSix + bag + Ultegra 6700 groupsets without Rims and tires = 14 lbs
• Mavic Aksium rear + front + pro4 tires = 7 lbs
• Neugent wheelsets 1440 grams + pro4 tires = 5 lbs
• Bag = 2 co2 cartridges, 2 tubes 100 gram each, 1 chain breaker, 1 spoke wrench, 1 co2 adapter = 1 lbs

• The Whole Bike Weighted on Scale
• SuperSix + Ultegra 6700 + Neugent wheeelsets + pro4 tires = 18 lbs

• The Whole Bike Weighted on Scale
• SuperSix + Ultegra 6700 + Mavic Aksium wheelsets + pro4 tires = 19 lbs

SuperSix Non Hi-Mod

SuperSix + Ultegra 6700 groupsets + Neugent wheeelsets + pro4 tires = 18lbs
SuperSix + Ultegra 6700 groupsets + Mavic Aksium wheelsets + pro4 tires = 19 lbs

SuperSix Hi-Mod
SuperSix Hi-Mod + Ultegra 6700 groupsets + Neugent wheeelsets + pro4 tires = 17lbs
SuperSix Hi-Mod+ Ultegra 6700 groupsets + Mavic Aksium wheelsets + pro4 tires = 18 lbs

SuperSix Hi-Mod Dura Ace 2, $5300, 14.77lbs, black color
SuperSix Hi-Mod + Dura Ace 9000 groupsets + Neugent wheeelsets + pro4 tires = 16lbs
SuperSix Hi-Mod + Dura Ace 9000 groupsets + Mavic Aksium wheelsets + pro4 tires = 17 lbs

2013 SuperSix non Hi-Mod Components	Grams	Pounds
Fizik Arione Saddle - Manganese Rails	261	0.58
C2 Carbon Seatpost	229	0.50
C2 Road Drop Handlebar 46cm Black	300	0.66
C2 Stem	121	0.27
BB30 bearings	70	0.15
XT pedals	342	0.75
Cables and Hanger	100	0.22
Bar Tape	56	0.12
Alloy Bottle Cages	60	0.13
	1539	3.39

Componets	9070 Di2	9000	Ultegra 6800	Ultegra 6700
Shifter Levers	237	365	425	445
Front Derailleur	114	66	89	89
Rear Derailleur	217	158	195	190
Crank	683	683	765	785
Chain	243	243	253	267
Cassette	166	166	212	210
Brake Calipers	297	297	335	317
Grams	2194	2343	2699	2748
Pounds	4.84	5.17	5.95	6.06

Components Ultegra 6800	Grams	Pounds			Components Dura Ace 9000	Grams	Pounds
2013 supersix carbon non-hi mod	1050	2.31			2013 supersix carbon non-hi mod	1050	2.31
Mavic Aksium Wheelsets	1735	3.83			Mavic Aksium Wheelsets	1735	3.83
Ultegra 6800	2699	5.95			Dura Ace 9000	2343	5.17
Skewers	120	0.26			Skewers	120	0.26
Pro4 tires	400	0.88			Pro4 tires	400	0.88
Tubes	200	0.44			Tubes	200	0.44
Fizik Arione Saddle - Manganese Rails	261	0.58			Fizik Arione Saddle - Manganese Rails	261	0.58
C2 Carbon Seatpost	229	0.50			C2 Carbon Seatpost	229	0.50
C2 Road Drop Handlebar 46cm Black	300	0.66			C2 Road Drop Handlebar 46cm Black	300	0.66
C2 Stem	121	0.27			C2 Stem	121	0.27
BB30 bearings	70	0.15			BB30 bearings	70	0.15
XT pedals	342	0.75			XT pedals	342	0.75
Cables and Hanger	100	0.22			Cables and Hanger	100	0.22
Bar Tape	56	0.12			Bar Tape	56	0.12
Alloy Bottle Cages	60	0.13			Alloy Bottle Cages	60	0.13
Paint	454	1.00			Paint	454	1.00
	8197	18.07				7841	17.29

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