


ethirteen Helix Core espec Cranks for ISIS Spindle - 155mm, 21.5mm Offset, Black
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
ethirteen Helix Core espec Cranks for ISIS Spindle - 155mm, 21.5mm Offset, BlackThe ethirteen Helix Core espec Cranks offer high end drivetrain integrity and a premium look at an exceptional value. Forged from tough 6066 T6 aluminum, these ultra short 155mm crank arms are optimized to maximize ground clearance on modern low BB e MTBs, effectively eliminating pedal strikes. Featuring a 21. 5mm offset for a compact, tailored Q factor on standard ISIS spindle motors, they come complete with an alloy self extractor system, steel
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Your ethirteen Helix Core espec Cranks for ISIS Spindle - 155mm, 21.5mm Offset, Black orders ship within 1-2 business days.
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- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
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★★★★★ 5
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Color: rose gold
Beautiful piece, larger than expected. Thought this was going to be very dainty, but it is very, very nice.
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Reviewed in the United States on February 22, 2026
★★★★★ 5
Good
Color: Silver
This is very good quality and I love the silver color, just exactly what I was looking for. The size is good. Very comfortable and it doesn’t weight too much. Very easy to use as well
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Reviewed in the United States on April 20, 2026
★★★★★ 5
It was exactly what was ordered and very timely.
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Very pleased.
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★★★★★ 4
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