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Ships within 48 hours · Estimated delivery Aug 2 - Aug 7
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Description
RockShox Upper Tube 2013-2015 BoXXer Straight-Wall Left BlackTapered steerers (when offered) are designated by 1. 5>1 1 8" spec info Replacement CSU (crown steerer upper) units and BoXXer crowns BoXXer top crown sizing reference (headtube+headset): short (3 4" drop): under 160mm tall (2" drop): 160 190mm *Totem and Lyrik CSU assemblies are from SoloAir fork model (will work with 2 StepAir, DualPositionAir (2P Air) and U Turn Coil models, but will not have travel gradients on stanchion) 2013 15 Reba and SID B
- Tapered steerers (when offered) are designated by 1.5>1-1/8" spec info- Replacement CSU (crown/steerer/upper) units and BoXXer crowns
- BoXXer top crown sizing reference (headtube+headset): short (3/4" drop): under 160mm/tall (2" drop): 160-190mm
- *Totem and Lyrik CSU assemblies are from SoloAir fork model (will work with 2-StepAir, DualPositionAir (2P-Air) and U-Turn/Coil models, but will not have travel gradients on stanchion)
- 2013-15 Reba and SID-B SoloAir CSU assemblies are not compatible with DualAir
- 2008-2013 SID-A CSU assemblies are for DualAir only (2009 and older fork parts are no longer available if not listed)
Today's Stock Status
6 Available to ship in 2-4 Business Days
UPC: 710845753541
EAN: Not available
Manufacturer Part Number: 11.4015.363.050
RS3458 FK9073
139906-Q0-L
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- Free Standard Shipping on $100+ Orders to the USA.
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Exchange/Return Notes
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4.9 ★★★★★
Based on 21 reviews
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Product Reviews
★★★★★ 5
Worth Spending
Size: X-Large, Color: B004
Super comfortable....
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Warm and comfy thermal wear
Size: Small, Color: Navy
They are very soft, don't ride up. Clothes do not stick to them like other thermals do. The fit is perfect. They are warm and comfy. The quality is good, too.
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Reviewed in the United States on January 23, 2026
★★★★★ 5
Comfortable, well made, washes well, would buy again
Size: Medium, Color: Light Grey
I bought these as a gift for my friend who lives in cold country and she says she loves them and they wash-and-wear well and are well made. Also very warm. Very comfortable and the fit is right on size. I would order them again
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Reviewed in the United States on January 21, 2026
★★★★★ 5
Perfect
Size: Large, Color: Navy
Oooooo these are so nice and soft and so warm! I am a nurse and work in an old hospital that is getting remodeled and there have been days we haven’t had heat and I have been very happy that I purchased these. My scrubs glide very nicely over these and don’t add any bulk. Definitely worth every penny! The fit is spot on and they wash up really well.
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Reviewed in the United States on December 12, 2025
★★★★★ 4
Warm and Comfortable for Everyday Wear
Size: XX-Large, Color: Light Grey
This thermal set is really comfortable and does a good job keeping you warm in colder weather. The fleece lining is soft and cozy without feeling too heavy, and it works well as a base layer under regular clothes.
The fit is true to size with a nice amount of stretch, so it is easy to move around in and does not feel restrictive. It is also lightweight enough to wear throughout the day.
The only reason for 4 stars instead of 5 is that it could be a little thicker for extremely cold temperatures, but it still works well for most everyday use.
Overall, this is a solid and comfortable thermal set that is great for layering and staying warm. I would recommend it.
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Reviewed in the United States on March 27, 2026