Syntace W40i Straight M40 EVO6 Disc 6-bolt 29" Wheel

Item number: 70666
W40i Straight M40 EVO6 Disc 6-bolt 29" Wheel - raceblack/29" rear 12x148 EVO6 SRAM XD
W40i Straight M40 EVO6 Disc 6-bolt 29" Wheel - raceblack/29" rear 12x148 EVO6 SRAM XD
W40i Straight M40 EVO6 Disc 6-bolt 29" Wheel - raceblack/29" rear 12x148 EVO6 SRAM XD
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  • Online since 1998
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The Pioneer: the W40i Straight M40 Wheel by Syntace

In the past, narrow rims and heavy tyres were the norm. Today, however, wide rims can be combined with new, lightweight tyre types. But really wide, high-quality rims were inevitably still a little heavier than their narrow brothers, or else durability suffered. Syntace was the first to break this vicious cycle in 2011. The original Syntace W35 rim was the first such wide and light alloy rim on the market. After more than 5 years of experience, Syntace has improved it more with an even better aluminium alloy and with a profile that has been further developed after many test runs.


Cross Country, Downhill, Enduro, Gravel
Wheel Size:
Tyre Type:
clincher tyre
Number of Spokes:
Brake Type:
6-bolt disc
Wheel Standard:
Tubeless System:
Tubeless Ready

Technical Information - Rim:

Syntace W40i
Dimensions (ETRTO):
Inner Width:
40 mm
Outer Width:
44 mm
Rim Material:

Technical Information - Rear Hub:

Syntace Straight M40
Over Locknut Dimension:
12 x 148 mm thru-axle
deep groove ball bearings
Body Material:
aluminium (7075)
Freehub Body:
40 tooth

Technical Information - Lacing:

Front Lacing Pattern:
Rear Lacing Pattern:
Spoke Type:
SuperSpoke by Sapim / straight pull / double butted (2.0-1.7-2.0)
Spoke Material:
stainless steel
Nipple Type:
ABS Q-Lock
Nipple Material:

Approved For:

Weight Limit:
130 kg (system weight)


  • massive reinforced rim bead, inclined to the outside
  • right angled embedding of the nipples
  • self-locking spoke nipples
  • special bearing grease
  • 25 % higher water absorption of the bearing grease
  • ratchet with 45 teeth


Stronger Than The Spoke:
Much more crack-resistant spoke anchoring in the rim base thanks to SmoothFit profile. Perfectly angled nipple embedded in the rim well. More durable than previous rim bottoms or mere shims that add weight to the rim but do not reinforce the edge of the spoke hole.

Inclined, massively reinforced rim flanges with a tread with a retaining groove for the best possible tyre fit, the result of rigorous testing. 25 % higher stability than the multiple test winner and predecessor W35.

3x Protected Bearings:
New double Syntace Dura-Seal sealing caps (Pat. pend.) protect the Syntace precision hub bearings which are now sealed on both sides. Filled with special grease, which has a more than 25 % higher water absorption capacity, further improved corrosion inhibitors and a high oil bleeding temperature.

Steel Inserts:
Patented, form-fit steel bars transmit power from the freehub body made of 7075 aluminium to the sprocket set every 120°. Meant especially for high torques in MTB, this is an insurance against inseparably twisted pinion assemblies. Easily replaceable. (License American Classic /USA)

Bearing Play Micro-Adjustable:
The new test bench-optimised hub body made of 7050 aluminium is trued by Syntace MicroAdjust caps, which are also new, scaled and now splash-proof. Also with different quick release or thru-axle tightening torques.


29" rear 12x148 EVO6 Shimano:
  • Freehub: Shimano MTB
  • Gearing: 8-/9-/10-/11-speed
  • Manufacturer Number: 151673

29" rear 12x148 EVO6 SRAM XD:
  • Freehub: SRAM XD
  • Gearing: 11-/12-speed
  • Manufacturer Number: 151666

Colour Index:

  • Rims: black w/ white decals
  • Hubs: black
  • Spokes: black


  • 1 x Syntace W40i Straight Straight M40 wheel (rear)


  • raceblack/29" rear 12x148 EVO6 SRAM XD: 1030 g


  • raceblack/29" rear 12x148 EVO6 SRAM XD, in stock

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