SRAM S600 MTB cranks
  85mm to 153mm
Price $109 to $409
depending on length and chainring options

Prices include: Labor to Shorten Arms, Chainrings & All Bolts
Prices shown good as of 5/5/2021

Ordering, Payment, Shipping & Contact info.

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Outstate MN residents add 6.875% sales tax.
Metro residents add 8.025% sales tax
Prices below are for cranks 120mm to 153mm length
Add $5 for lengths 85mm to 119mm as these require spot-facing to provide a flat surface for the pedal.

$109 With 22-32-42 TruVativ Steel Chainrings

Strong, cold forged arms, with a hard, tough finish.
Inexpensive because the stock chainrings are painted steel. But they are heat treated chrome-moly and are ramped and pinned so shift reliably.  Rings are spaced for 8 or 9 speed indexed shifting.
S600 With TruVativ Alloy Chainrings
Alloy rings are high pressure forged from ultra hard 7075-T6.
$187 with 22-32-44t Alloy TruVativ Chainrings
$172 with 22t Steel &
32-44t Alloy TruVativ Chainrings
$147 with 22-32t Steel &
44t Alloy TruVativ Chainrings
The outer 44t is 4mm thick to resist bending

Square taper BB

SRAM recommends a 113 mm BB Spindle for a good chainline on bikes with 130 or 135mm rear spacing.

However the left arm of the S600 sits further out than the right. So I recommend a 110mm spindle length and I'll supply a 1.5mm spacer to install between the right BB cup and the frame. This gives the same 48-49mm chainline, but even pedal offsets and a narrower Q-Factor.

118mm is best for tandems with 140-145mm rear spacing. For 160mm rears, try to find a 122mm or even an old 127mm.
For standard bike parts, it's always best to support your local shops. They should have a Shimano BB-UN300  BB cartridge for about $25.

Q factor
; 167mm with Shimano 110mm spindle. Great ankle clearance.

Bolt Circle Diameter (BCD) The middle and outer ring are 104mm BCD, inner is 64mm.

"Safely" is a relative term. Modern cranks hopefully have a margin of safety to allow for the occasional 280 lb mountain biker. Shortening will obviously reduce this safety margin, as there will be less aluminum around the pedal hole than before. But the S600s are pretty beefy wherever I put the new pedal hole.

Scroll down for more Chainring Options

If you want just the arms, no chainrings.
You may save a little on postage. But since over 1/2 of buyers opt for an alloy chainring upgrade, I have boxes of unwanted steel rings. So I can't give you credit for them.
Race Face Narrow-Wide Chainrings
These rings keep the chain from coming off, without retention systems.
S600 with 30t Chainring (150mm Shown)
$165 for 30t, $150 for 32 or 34t or
$155 for 36 or 38t
In order to fit a 30t ring on a 104mm Bolt Circle, the female part of the chainring bolt is machined as part of the chainring, adding to material and machining cost.
Available in Black, Blue, Red, & Lime Green,

30t get black steel chainring bolts. For chrome add $6
Race Face rings are CNC machined from ultra hard 7075 aluminum.
22/36/Guard or 24/36/Guard for 10 or11 speed
24/36/Guard 
Sturdy Guard and 36t ring are 7075 alloy
$169 with steel 22t or $179 with alloy 24t
 

10 and 11 speed cranks and rings index interchangeably.

The Ultimate Setup for Recumbents
Mountain Triple Q-Rings are no longer made. I stockpiled what I could and still have a few 23-33-42t sets.
$379 Shortened SRAM S600 cranks with 23-33-42t Q-Rings
Price includes the longer chainring bolts Q-Rings require.

Expensive? Yes!  But worth it for hills and sore knees.
I'm getting nothing but positive feedback from the over 50 sets I've sold.
CNC machined in Spain from ultra hard 7075-T6 aluminum.

Q-rings provide a modest advantage on upright bikes.
But on a recumbent the difference is like night and day. 
We've got 7 recumbents and not a round ring on any of them.

On recumbents, Q-Rings smooth out the uneven pedaling and significantly reduce the stress on your knees. And in most cases, riders report more speed for the same effort.

As one gent wrote when ordering a 2nd set for his other 'bent;
"Riding my 2 Catrikes back to back, the round rings feel lumpy and the lumpy rings feel round"

Why they work so differently on 'bents is complicated.  Please check out my posting on the subject on Bent Rider Online
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