Grand Cru 50.4 BCD Crankset
Classic 50.4 BCD cranks, like the TA, Stronglight 49D, and others, are still sought after by randonneurs and cyclo-tourists. These cranks offer tremendous versatility since chain rings from 28t to 62t fit. They are also light and have narrow Q-factors, or tread.
While the Grand Cru 50.4 Crankset looks like a classic, we have made several important improvements. They are cold forged from 7075 aluminum alloy. The rings are thicker so they don't flex as on classic cranks. The outer rings have modern shifting aids such as ramps and pins, so shifting performance is much improved. All stainless hardware with allen head nuts/bolts. Includes aluminum machined dust caps and BB bolts. Dust caps function as self extracting crank hardware.
- Teeth: 46/30
- BCD: 50.4mm
- Q Factor: 144mm
- Chainline: 43.5mm
- Speeds: 5-11 compatible
- Taper: JIS square taper
- Suggested Bottom Bracket Spindle Length: 118mm
- Pedal Threading: 9/16"
Weight: 654 gr (for 170 mm cranks with hardware)
I have this crankset on a Soma GR with 584/42 rubber, a 12-26 (27?) 9spd cassette, and Sun derailleurs. This is the best drivetrain of my experience, with flawless shifting and a great range of gearing (top is a realistic 101 gear-inches). I wouldn't know how to judge quality but this item is holding up very well in every way. My Raleigh Grand Prix (bought new 28 Dec 72) will get one when I restore it. I'd like one on my touring bike as well, but I haven't yet found a 10spd cassette that would work with it to give the gearing I want (20-100 gear inches, 584-47 tires).
Unfortunately I have not installed on my bike build. Cannot find a bottom bracket to put the crankset on. All on backorder everywhere I search
A very affordable crankset with traditional styles and contemporary materials. For me it's situated right below the top tier cranks like White Industries and Rene Herse, but it's also less than half the price and nearly the same weight. The shifting works great, all sides of the crankset and chainrings are polished, and while the 50.4 aesthetic can be hit-or-miss for people, it's a home run for me.
I just finished up a resto-mod project on a 1967 Raleigh that I found at a thrift shop. I wanted a crankset that would work with a newer nine speed Ultegra drive train but still have the look of a late sixties crank. This worked great! Such a beautifully made crankset. Feels very solid and looks fantastic!
I built up a new Gunnar Sport this summer and decided to try these cranks. I absolutely love them. The 170mm crank arms are a nice comfortable length. With the 46/30 chainrings I can run standard 11 speed Ultegra cassettes and still get a very functional setup with nice tight spacing between gears and an almost 1:1 ratio on the low end. On the high end, the 46x11 is identical to the 50x12 on a typical compact crank. so you only lose one gear on the high end of the cassette. For me, this is high enough to comfortably pedal up to about 35MPH. Faster than that, I am probably better off coasting anyway. In my opinion, most recreational riders would be better off on this crank than the “race” gearing forced on them by the bike companies. This is one major advantage to building from scratch, freedom of choice.