![]() Used on some mountain bikes with oversized handlebars. When purchasing, or replacing a stem, it is important to know what type and what size is needed. Other dimensions, such as stem length and angle will be explained in a separate post. 1 1/4in steerer, 31.8mm bar clampįound on some mountain bikes and also some drop-bar machines such as Giant’s cyclocross bikes. Introduction This post explains stem size standards in terms of steering column attachment and handlebar attachment at the opposite end of the stem. The standard size for most modern mountain and road bikes, with typical lengths of between 35mm and 80mm for MTB stems, 80mm and 100mm for gravel bikes and 90mm to 140mm for road bikes. As ever, more exist – and some bikes, such as the Canyon Aeroad CFR, use a proprietary system – but this captures the majority of common options on the market. The main standards you’ll find for bike stems are summarised below. When we talk about stem standards here, we’re primarily talking about compatibility with the streerer tube on your bike (measured in inches), but also the handlebar clamp (measured in millimetres). Bike stem standardsĪlthough bike stems may look simple, there’s a significant amount of complexity in choosing the right one for your bike, largely due to the bike industry’s custom of developing multiple standards. However, you can still find quill stems on some retro-style fixies and singlespeed bikes, as well as some boutique custom builds or cheaper town bikes. It’s easier to manufacture too, because with a quill stem the steerer tube needs to be threaded, with a screw-on top headset bearing. Quill stems went out of fashion because the contemporary bolt-on stem and fork design is stronger and lighter. This was an inverted L-shape, with the shaft of the stem slotting down into the top of the fork’s steerer tube, and secured by an expander bolt with an (in most cases) Allen key head at its top. Quill stems remain elegant, if no longer practical. However, a professional bike fit will help you hone in on the perfect setup, and factor in the influence of stem length on the rest of your position. We’d recommend experimenting with a different stem length if you want to make small, incremental adjustments to your riding position or the handling of your machine. On the flip side, if you’re feeling cramped on the bike, using a slightly longer stem will increase the reach. On that note, you can also change your stem length to adjust the reach from the saddle to the handlebar.Ī shorter stem will reduce the reach and provide a more upright position, which might help if you’re feeling too stretched out. Generally speaking, a shorter stem will result in faster handling, while a longer stem will result in slower, more predictable handling.Īs a result, fine-tuning the stem can be one way to tweak the handling of your bike – but remember, your stem doesn’t exist in isolation and changing the stem length will also impact your position on the bike. Stem length is one of a number of factors, along with head tube angle and fork rake, that affects a bike’s handling. Gravel bike stems typically sit somewhere between the two. Mountain bike stems are typically around 50-80mm long, while road bike stems are longer, starting at around 80mm and extending to 120mm or longer as the frame size increases. The length of a stem is one of the most important factors to consider if you are looking to change the stock option on your bike. We offer a 45 day return period on all new items.Stem length has a big impact on the overall fit and ride of your bike. We have great prices on Usps Priority & Express services, all services will includeĪ tracking number. We are experts at international shipping so please buy withĬonfidence. ![]() International shipping is available on 99% of our products. Shop/shipment center on the West and East Coast. Everything ships pretty darn fast since we have a Service will likely be USPS or FedEx depending on the size of the package.
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