The Rail 5 625 is an electric mountain bike built for ripping the big stuff. It features the same high-end trail tech as our analogue trail bikes, plus a powerful new Bosch drive system that's basically like having your own shuttle. You’re looking for an e-MTB that’s just as ready to shred as non-electric trail bikes. You want a powerful Bosch drive system that’ll propel you up climbs so you can hit lap after lap. A burly alloy frame with 150 mm of rear travel that fully encases a long-range 625 Wh battery, an e-MTB optimised 160 mm RockShox 35 Gold RL fork, a powerful Bosch Performance Line CX (250 W, 85 Nm) motor that assists up to 20 mph (25 km/h in Europe) and a Purion controller. Plus, a 1x12 drive train with a wide gear range so you can always find the ideal cadence for the motor, a dropper post, powerful 4-piston brakes for more downhill confidence and 29er wheels with nimble ye...
Buy a bike from Larkfield Cycles and your first service is on us!
Simply pop the bike back to us and leave it with us for 1-2 working days, where we will make sure the bike is running as smoothly and efficiently as possible.
We recommend you bring the bike back to us around 6 weeks following your purchase, and will honour this service up to 3 months.
If you require a more comprehensive service please check out our workshop page here
| Frame Size | Height (cm) | Height (ft) |
| 47cm | 152-158cm | 4.11-5.2 |
| 50cm | 158-163cm | 5.2-5.4 |
| 52cm | 163-168cm | 5.4-5.6 |
| 54cm | 168-174cm | 5.6-5.9 |
| 56cm | 174-180cm | 5.9-5.11 |
| 58cm | 180-185cm | 5.11-6.1 |
| 60cm | 185-190cm | 6.1-6.3 |
| 62cm | 190-195cm | 6.3-6.5 |
| Frame Size | Height (cm) | Height (ft) |
| 49cm | 156-162cm | 5.1-5.4 |
| 52cm | 163-168cm | 5.4-5.6 |
| 54cm | 168-174cm | 5.6-5.9 |
| 56cm | 174-180cm | 5.9-5.11 |
| 58cm | 180-185cm | 5.11-6.1 |
| 61cm | 185-191cm | 6.1-6.3 |
| Frame Size | Height (cm) | Height (ft) |
| XS | 147-155cm | 4.10-5.1 |
| S | 155-165cm | 5.1-5.5 |
| M | 165-175cm | 5.5-5.9 |
| L | 175-186cm | 5.9-6.1 |
| XL | 186-197cm | 6.1-6.6 |
| XXL | 197-203cm | 6.6-6.8 |
| Frame Size | Height (cm) | Height (ft) |
| XS | 145-155cm | 4.9-5.1 |
| S | 155-165cm | 5.1-5.5 |
| M | 165-173cm | 5.5-5.8 |
| ML | 173-180cm | 5.8-5.11 |
| L | 180-188cm | 5.1-6.2 |
| XL | 188-195cm | 6.1-6.5 |
| XXL | 195-203cm | 6.5-6.8 |
'Medium' is intuitive. '17.5' is not. Alpha sizing makes it easier for you to know what Trek mountain bike will work for you. A lot of other brands also use alpha sizing, and if you ride a medium in a different brand, you’ll probably ride a medium Trek as well.
Trek frame size used to be measured by the length of the seat tube. But modern mountain bike geometry is based on reach, not seat tube length. Alpha sizing is simpler and helps you find the right fit by the measurement that matters most.
| Alpha size | XS | S | M | ML | L | XL | XXL |
| Frame size | 13.5 | 15.5 | 17.5 | 18.5 | 19.5 | 21.5 | 23 |
Trek offers mountain bikes in a wide range of sizes to ensure the perfect fit for all riders. That includes an XXS with increased standover height, an ML (medium-large) perfect for those in-betweeners in the middle of the sizing bell curve, and an XXL for taller riders who often struggle to find a bike that’s big enough.
Not all sizes are available on all models, but Trek’s extended size range will help any rider find a frame that fits better from the start and requires fewer changes to the cockpit.
The easiest way to determine your frame size is by height, but many riders find that they are between sizes. Choosing to go up or down a size depends on your personal riding style and body proportions.
A bike with a longer reach will have a longer wheelbase. That makes it more stable, especially on high-speed descents. That’s great for riders who like to plough through rather than pop over rough stuff on the trail. If you have a relatively long torso or arms for your height, you may find that a longer reach gives you a roomier, more comfortable cockpit.
A bike with a shorter reach will have a shorter wheelbase. It’s not as stable, but it’s more nimble and easier to flick around. That’s great for riders with a more playful, active riding style who like to get off the ground and whip their wheels around. If you have a relatively short torso or arms for your height, you may find that a shorter reach makes it easier for you to hold the handlebars comfortably.