Zipp Service Course B2 Seatpost

I am an experienced bike mechanic with 30 years of amateur mountain bike racing and professional bike work under my belt. I always use high quality Park Tools, including a $150 Park Torque wrench to set proper newton meter (nm) levels when working with carbon frames and carbon components. In addition, I have been riding ZIPP products, including their utterly amazing 303S wheelset and SRAM XO, Eagle, Force and RED drivetrain components, for many years now. I bought this ZIPP Service Course seat post in hopes that it would be of the same high quality quality and design that I have seen in prior Zipp/SRAM products. Unfortunately, the quality is there but the design is poor in one key regard. I just installed the new seat post on my 2021 Santa Cruz Stigmata CC to replace an ENVE all carbon post that used to creak after every 3rd or 4th ride. Well, the inner seat bolt in the new ZIPP seat post stripped with less than 4 nm of pressure barely 5 minutes into installing it. The issue appears to be that the design of the seat bolt clamp has the inner bolt slotted so deep into the actual seat post itself that it is very difficult to line up the 5mm allen key so that it seats straight in the inner bolt when tightening it. Rather, the angle is slightly off and, frankly, difficult to get the allen key into the small cramped space for the inner bolt to begin with. This design aspect is what caused the inner bolt head to strip. When the outer bolt eventually strips (as the design is based on stnd. counter-tension between the two bolts), the entire seat post will need to be removed and thrown away because the inner bolt will always be fully or partially stripped based on how deep the inner bolt is slotted into the clamp. In contrast, the outer bolt is very easy to access and allows you to insert the allen key into the outer bolt head straight as an arrow. It's a really poor design from an otherwise sterling and high quality component manufacturer (SRAM). In my opinion, their design engineers need to go back to the drawing board with this seat post and just redo it by moving the inner bolt out of the deeply recessed and cramped hole in which it is located. I would not recommend this seat post to anyone. In fact, I'll be throwing it away this weekend in the metal recycling bin and going to my LBS to find something that I know will work long-term. Otherwise, I would typically purchase anything ZIPP or SRAM without reservation. Just not this particular product.

The seat post allows you to dial in your seat angle with fine granularity.If you're an older guy trying to sit on a young guy seat, every .1° matters. :)The post weighs a little more than I expected, but it isn't their high end. It is exactly like the way you would adjust a Thomson seat post. I needed a setback as that's how my frame is designed. I don't like the way Thomson does theirs with the bent look. This post is only same level as mid level Easton, or FSA.I have a Zipp drop bar too.. I like their stuff for road bikes.

I bought this as part of an overall bike upgrade. It wasn’t a must have, but I thought the bare finish looked better than the black seat post the bike came with. It seems to work well. I have other zipp products and they all seem to be good quality, durable parts. I run them on road and gravel specific bikes with no issues so far. Zipp has a good reputation for a reason.

Great in all other regards, but the adjusting bolts are nearly impossible to reach with a typical multi-tool. I have to carry an extra-long allen wrench just for this when I ride, so I can make adjustments if needed.

Fits perfectly with my bike. The seat went on perfect as well.