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The Most Expensive XC Mountain Bike You Can Build

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In putting together a recent Singletracks product picks email full of outrageously expensive mountain bike gear, I wondered: what is the most expensive mountain bike a person could spec? Greg did a great job tracking down the 9 most expensive mountain bikes in the world, and with so many seemingly-expensive products out there, I figured it would be easy to top even the bikes on that list. But this research project proved more difficult than I imagined!

How much is a bike worth?

Before I dive into my choices below, I want to address a fallacy that many mountain bikers lean into when valuing a bike. The argument goes something like this: a bike is purchased for $4,200 and within a year or so, the owner upgrades to a nice set of $1,800 carbon wheels. Now the bike is worth $6,000, right? The thing is, pretty much everyone can see the problem with this argument, except for the owner.

The “old” wheels clearly have value; perhaps someone on Craigslist will pay $400 for them, yielding a more reasonable value is $5,600. But wait! Often times the bike company sells a nicer build of the same bike for $5,200 that includes comparable carbon wheels from the start. The difference is the bike company didn’t have to pay the full retail markup on the carbon wheels.

With this in mind, I’ve chosen to start with an XC mountain bike frame that doesn’t ship with any components. Sure, anyone can start with an $8,000 bike and add ENVE wheels and an XTR Di2 drivetrain to get to a $14,000 valuation. But where is the fun (or the accuracy) in that?

One final note: the components chosen for this expensive XC bike build were selected based on price and not necessarily weight or performance. The only criteria is these parts must be appropriate for this type of bike. For example, studded tires are expensive, but don’t make sense for an XC bike.

Let’s get started!

An Expensive XC Bike Frame

I started my research assuming I would quickly find some boutique frame builder selling a ridiculously expensive XC mountain bike frame. Instead, what I found is that while there are clearly some very expensive custom frames available, pricing is not standardized and is only bound by the buyer’s imagination. So yes, while there is probably a bike frame builder out there who can build a gold-plated bike, or build a bike with ridiculous angles and welds, I want to focus on bikes that are slightly more accessible. This means the frame needs to have a price tag on it.

Two of the bikes on Greg’s list of the most expensive mountain bikes, the BMC Fourstroke and Bianchi Methanol, are–or were at one time–offered for purchase in a frame-and-shock-only configuration. However, Bianchi is not selling the Methanol in the USA this year.

That leaves the full-suspension, carbon-fiber BMC Fourstroke 01, which retails for $3,999 USD. That price includes the Kashima-coated Fox Factory shock and a carbon seat post. For many mountain bikers, $4,000 is a lot of money to spend on a bike… and we’re just getting started.

The Most Expensive Drivetrain

Shimano’s XTR-level Di2 electronic drivetrain currently sits at the top of the market in terms of pricing. This is understandable given the complexity of an electronic drivetrain, which adds extra bits like batteries and electronics to an already high-precision mechanical system. By upgrading the mechanical parts of the drivetrain, it’s possible to drive the cost even higher.

Starting with the electronics, a Shimano XTR Di2 rear derailleur retails for $572 USD, and the accompanying electronic shifter is $217. We also need a display ($142), a battery pack ($143), a junction box ($112), and cables (say, $60) to make the whole thing work. To jack the price up even higher, I’m going to go with a 2×11 configuration, which means we’ll also need a Di2 front derailleur ($354).

For the crankset, I’ll start with RaceFace Next SL G4 crank arms for $480. Since this is a 2-by drivetrain, I’ll need to add a $60 spider to mount both rings. For the rings themselves, Rotor’s X2 rings are nice and expensive, at $146 for the big ring, and $99 for the little ring. Crankset total: $785.

Even more bling than Eagle! photo: KCNC

Customizing the base XTR Di2 drivetrain with a little extra bling is easy. Actually, I skipped an important part of the drivetrain–the cassette–because Shimano’s XTR 11-speed cassette is just too affordable. Instead, I found a Shimano-compatible titanium cassette for $490. The Shimano XTR crankset doesn’t come with a bottom bracket, so an appropriate Shimano-compatible, coated bottom bracket from Ceramic Speed ($499) should do the trick.  The only thing that is missing (other than an optional $150 chain guide) is the chain itself. Again, titanium is the way to go–this 11-speed titanium chain retails for $227. If a titanium chain seems too gimmicky, Muc Off has a nanotube coated chain for just $145 that could be a good option.

photo: Ceramic Speed

One interesting item I found while researching expensive mountain bike drivetrain bits is a pair of after-market Shimano pulley wheels from Ceramic Speed that should work with our Di2 derailleur. These 3D-printed, titanium, nano-coated pulley wheels sell for an eye-popping $1,000 for the pair! I won’t include those in the cost of the build since we already have a complete derailleur, but just know that they do exist.

Expensive Suspension and Brakes

For cross country bikes, it’s not difficult to find lightweight–and expensive–suspension fork options. The RockShox RS-1 adds a third dimension–high performance–to the equation, and the $1,865 price reflects that.

photo: TrickStuff

High-end mountain bike brakes from even the largest brands tend to top out at fairly-reasonable price levels. So, I decided to look for something a bit more exotic, and ultimately landed on the Trickstuff CLEG 2 brakeset ($595). Trickstuff claims this is the lightest set of hydraulic disc brakes on the planet, and the minimalist design is sure to turn heads.

The Trickstuff brakes don’t include rotors, so why not go for a set of ceramic rotors from Alpha? A pair of rotors weighs just over 100g and is priced at roughly $180 USD. Note: Alpha recommends running at least 180mm rotors for XC riding, which is larger than a typical XC rotor. The necessary bolts (titanium, natch) and adaptors are not included in the overall cost.

Everything Else

It’s pretty easy to blow a lot of coin on a set of wheels, especially going the custom route and choosing the most expensive rims, hubs, and spokes that money can buy. Plus, there is the added expense of having the wheels built. Instead of spending money and time, I chose to go with the most expensive stock set of XC wheels I could find: the Enve M525 carbon fiber wheelset ($2,800). The good news for buyers is these are not just race-day wheels; they’re designed to be ridden daily.

For tires, it’s hard to find a lighter, racier set of XC skins than the Scwhalbe Racing Ralphs. There are many variations on this tire, but at $104 MSRP (per tire), the tubeless-ready, Double Defense, SnakeSkin 29×2.25″ version is one of the most expensive.

I found a $430 Selle Italia SLR Tekno saddle that utilizes carbon fiber not only for the cover and shell, but also for the rails. Crankbrothers claims the Eggbeater 11 pedals are the lightest mountain bike pedals in the world, designed for pro-level XC racers. The $450 pair of pedals utilizes titanium for the spindle, body, and wing for a total weight of just 179g.

The BMC Fourstroke 01 frame includes a carbon seatpost, though many riders may prefer a dropper post. Since the frame already has a seatpost, I won’t add the cost of a separate post. However, the KS Lev-CI carbon dropper post is a good lightweight, short-travel option available for $515 MSRP.

A Pricey Cockpit

Carbon mountain bike handlebars tend to be expensive, but apparently not as expensive as titanium ones. The most expensive bars I could find are the Thomson Ti Riser bars at $389, which are priced more than $100 higher than the flat version. A fancy bar like this deserves to be supported by a high-end stem, and Enve has just the thing for $265.

Finding an expensive set of grips for an XC bike isn’t easy; the more expensive grips tend to be leather (heavy) or designed for ergonomics rather than racing speed. I finally settled on the Fabric Slim grips because they are some of the lightest lock-on grips available, and they cost slightly more than an average pair at $35.

Accessories

Fortunately, the BMC Fourstroke 01 frame includes a seatpost collar and headset so there’s no need to add additional costs for those items. The frame includes bosses for a single water bottle cage, so buyers might want to pick up a Serfas Vendetta carbon fiber bottle cage for $55 (bottle not included). A chainstay protector would probably be a good investment as well.

What’s the damage?

Building up a BMC Fourstroke 01 mountain bike with the options outlined here will cost $14,814 as of the time of this writing. Of course, that’s retail pricing, and actual component prices may end up being lower.

In researching this build, I pursued an alternate path with an OpenCycle ONEPlus, a carbon 29er hardtail that weighs under 900g. The frame itself costs less than the BMC Fourstroke 01–$3,200–but it doesn’t include a seatpost. Adding in the KS Lev-CI, the cost for using the same parts as the BMC build comes to $14,271–just $284 less than the full suspension build. To put that difference in perspective, a high-end rear shock costs nearly $500.

It Could’ve Been Worse…

I have no doubt that there are more expensive mountain bike frames and components than the ones I chose for this build. The more bespoke the build and the more exotic the materials used, the higher the price tag will be. Seeing that $1,000 derailleur pulley wheels exist, clearly the sky is the limit.

Your turn: Where would you make changes to this build to drive up the price even more? Would you be interested in owning a bike like this?