RELATED PAGES: Compass / IRD /Sugino /TA /VO /White Industries
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46/30T
Made by: VO; IRD; Sugino; Compass (Herse); TA; White Industies
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EXAMPLE
VO Grand Cru 50.4 BCD Crankset MK II (46/30T) $200
Chain rings from 28t to 62t. Narrow Q-factors. Fits square taper BBs. The rings have modern shifting aids. 5-10 speed compatible. Shifts well with double or triple front derailleurs. About bottom brackets: Most road frames use a 118mm BB. Bikes with 135mm spacing and room for big tires may need a 122 BB with a spacer. Available in 165mm, 170mm, and 175mm lengths.
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GEAR INCHES (with 38mm tires): 46/30T X
11-32 = 25.8 to 114.9
11-34 = 24.2 to 114.9
11-36 = 22.8 to 114.9
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WHAT IS NEEDED
Shifters: Shimano STI (e.g., Tiagra)
Front derailleur: May be able to use standard road FD (e.g., Tiagra), but may need something like the Shimano CX-70
Rear derailleur:
Tiagra shifts to 34T (achieving 24.2 GI)
Deore shifts to 36T (need Deore 9 speed to go with STI shifters) (to achieve 22.8 GI)
Cassette: Either 34T (stock) or 36T
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COMPARISON WITH STOCK GIANT REVOLT
48/34T X 11-34 = 27.5 to 119.2 GI
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COMPARISON WITH ALTERED REVOLT
Alter using 11-36T and Deore RD: 25.1 GI
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GI GAINS FROM STOCK
36T & Deore RD: 27.5 - 25.1 = 2.4 GI (cost = $120)
Super compact only: 27.5 - 24.2 = 3.3 (cost = $200 - 255)
Super compact + 36T & Deore RD: 27.5 - 22.8 = 4.7 (cost = 320-375)
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COSTS
36T & Deore RD: 60 + 60 = $120
Super compact only: $200 (may also need FD, add $55)
Super compact + 36T & Deore RD: 120 + 200 = $320 (may also need FD, add $55)
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COMPARISON WITH A TRIPLE (MAZAMA)
The Novara Mazama uses a triple with Bar end shifters.
Gear inches: 20.9 to 119.8
Crankset: Shimano Deore, 48/36/26; Cassette: Shimano HG62, 11-34, 10-speed. Derailleur: Shimano Deore
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http://www.blackmtncycles.com/2013/01/bells-and-whistles.html
http://epicureancyclist.com/review-sugino-ox601d-compact-plus-aka-the-impossible-crankset-44-26/
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http://www.cyclingabout.com/gear-ratios-how-to-select-touring-bike-gearing/
WHite Industries we haven’t been able to make Sram front changers work very well with our vbc rings. That said… I’ve not tried