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Zipp Service Course SL-OS Stem

Now £94.99
Save 21% RRP: £121.00
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Product Description

Oversized Performer

Selecting the correct stem is crucial to your fit, form and function on the bike. It needs to be stiff so you’re not flexing away precious energy in sprints and accelerations. It must be reliable and strong but light. It has to adjust to your personal fit needs.

The all-new Zipp Service Course SL-OS Stem checks off all of those boxes. In a first for Zipp, this ±6° stem is compatible with the “oversized” 1-1/4 inch steerer tubes used by frame makers Giant® and Canyon®. For those riding standard 1-1/8 inch steerer tubes, the Service Course SL-OS offers new fit options with included shims allowing the stem to be adjusted for ±4° ±6° or ±8° angles. The stem also is available in seven lengths from 70 to 130mm. All that helps you dial in your position on the bike like a pro.

Forged from high-strength 7075 series aluminum, this stem is lightweight and stiff with a 1.73g/nm stiffness to weight ratio for better control and responsiveness. Features titanium hardware and TORX® heads on all bolts for precision torque readings and ease of adjustment. (More information below.)

Available in high-polished Black with silver laser-etched graphics

Zipp chooses Torx®-head bolts for its stems and aero bars - why? It’s simply a better bolt:

  • Won’t easily strip.
  • give more accurate torque readers.
  • Are durable.

It comes down to the way the tool head interacts with the bolt. Common hex tools tend to strip the bolt head if the bolt is over torqued. This is especially true with lightweight bolts. Zipp wanted to be able to use a lightweight bolt with reliable performance. Bolts on stems and aero bars are critical to safety – having a reliable bolt is crucial. The Torx® head is more robust that hex-head bolts and will not easily strip. Torx® fasteners also were designed for use with a torque-limiting wrench (torque wrench), which is needed to achieve the precise torque reading for proper installation.

We chose a bolt size, M5, that was best suited for our stems. The standard Torx tool head for an M5 bolt is a T25, although sometimes a T20 or T27 is used. The T25 is becoming a go-to bolt in the bicycle industry. It’s been used on disc brakes for years and also is in use on chainring bolts, derailleurs and shifters. What’s more, the T25 tool is a common in bike shops or hardware stores and is readily available alone or in multi-tool sets. For your convenience, Zipp includes a T25 wrench with all stems and aero bars.

Specifications:

  • Weight (100mm): 140g
  • Sizes: 70, 80, 90, 100, 110, 120, 130mm
  • Material: 7075 Aluminum
  • Hardware: Titanium with Torx® T25 heads
  • Clamp Diameter: 31.8mm
  • Angle: ±6° (1-1/4); ±4°; ±6; or ±8° (1-1/8)
  • Steer tube diameter: 1-1/8 or 1-1/4in
  • Stack height: 41mm
  • Clamp width: 47mm
  • Clamp torque - max: 5Nm



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Stems Guide

What are stems?

The stem is the component that attaches your handlebar to your fork steerer. It has a clamp at either end, at 90 degrees to each other.

Who needs a stem?

Stems rarely need to be changed due to damage, but you might decide on an upgrade to save weight or to change your reach on your bike.

What are the choices?

Although your choice will partly be based on getting the right clamp size for your handlebars, you will also need to decide what length stem you want. Longer stems will increase your reach, while a shorter stem will decrease it and can sharpen up your bike’s handling.

What should I buy with them?

Many people will choose to upgrade their handlebar along with their stem, for compatibility or to get a pleasing matching set.

Anything else?

It’s crucial that you check the clamps at both ends of your stem are compatible – you need one for the right size headset and the right handlebar width.

Delivery & Guarantee

Christmas Delivery

We will try our very best to get your products delivered to you before Christmas, but due to Santa's overspill into our delivery services, we would like to make you aware that while we are making every effort to deliver your order to you in time for Christmas, there may be a potential risk of delay.

The last date to order a bike that is available for Christmas delivery is 5pm on Tuesday 18th December. For all other items the last date to order items that are available for Christmas delivery is 12pm on Wednesday 19th December.

You can easily spot which items are guaranteed for Christmas delivery with the icon. Choose your size and colour to see if the item qualifies for Christmas delivery.

UK Delivery Information

We are committed to offering fast and free delivery, whether you're ordering bikes, accessories or clothing. Our standard delivery service is FREE to mainland UK, regardless of the size and on all orders over £20.

Please note that bulky products and bikes shipped to outlying UK regions are excluded from free shipping.

Please note that Pre-Order dates can sometimes change due to updated stock information.

Click here for more UK and international delivery information.

Returns & Warranty

It's easy to return a product with our 365 day, hassle free returns. 

We will give you a full refund or exchange on any item that is returned to us unused/unfitted, in a resaleable condition and in its original packaging (where possible).

Please note: For hygiene reasons, we cannot accept returns of facemasks, undershorts or underwear if the item has been removed/unsealed from its original packaging.

If your item develops a fault or arrives damaged, please contact us first so we can resolve the issue for you as quickly as possible.

For more information please visit our Returns & Warranty page.

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