The ride, not just the specs
Made to race cross-country.
Procaliber is a cross-country race hardtail: light, efficient, and ready to go fast from the gun.
Whether you race every weekend or just love a fast lap, it rewards every pedal stroke.

Trek / Cross Country Mountain Bikes
Race-ready, from the first pedal.
Procaliber frameset is a race-worthy carbon cross country mountain bike frame that's light, fast, and built to win. It has the unique advantage of IsoSpeed, a decoupler at the top tube/seat tube junction that gives you more compliance on rough trails for a smoother, faster ride.
Based on the bike's size chart. Your complimentary baseline fit in store dials in the rest.
Ship to store · free pickup, usually ready in 4–7 business days
Questions are welcome. No pressure, no bike jargon required.
The ride, not just the specs
Procaliber is a cross-country race hardtail: light, efficient, and ready to go fast from the gun.
Whether you race every weekend or just love a fast lap, it rewards every pedal stroke.

What makes it special

IsoSpeed takes the edge off body-beating small bumps and trail chatter so you can stay stronger longer, without giving up any pedaling efficiency.

Straight Shot downtube gives you an extra-stiff frame without adding any weight, so you can stick your line through the rough stuff and still fly up the next climb.
For the detail-oriented
Tap any group to see every part.
Measurements in cm unless noted.

| Size | S | M | ML | L | XL | XXL |
|---|---|---|---|---|---|---|
| Rider height | 5'1"–5'5" | 5'5"–5'10" | 5'8"–5'11" | 5'10"–6'2" | 6'2"–6'5" | |
| Seat tube (A on the drawing) | 39.3 | 41.9 | 44.4 | 47.0 | 51.0 | 54.5 |
| Seat tube angle (B on the drawing) | 72.8° | 72.8° | 72.8° | 72.8° | 72.8° | 72.8° |
| Head tube length (C on the drawing) | 9.0 | 9.0 | 9.0 | 9.0 | 10.5 | 12.0 |
| Head tube angle (D on the drawing) | 68.8° | 68.8° | 68.8° | 68.8° | 68.8° | 68.8° |
| Eff. top tube (E on the drawing) | 57.0 | 59.5 | 61.0 | 62.5 | 65.9 | 68.3 |
| BB height (F on the drawing) | 31.3 | 31.3 | 31.3 | 31.3 | 31.3 | 31.3 |
| BB drop (G on the drawing) | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 |
| Chainstay length (H on the drawing) | 43.2 | 43.2 | 43.2 | 43.2 | 43.2 | 43.2 |
| Offset (I on the drawing) | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 | 4.2 |
| Trail (J on the drawing) | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 | 10.0 |
| Wheelbase (K on the drawing) | 107.8 | 110.3 | 111.8 | 113.3 | 116.8 | 119.4 |
| Standover (L on the drawing) | 71.5 | 75.5 | 76.5 | 78.4 | 81.4 | 84.1 |
| Reach (M on the drawing) | 39.5 | 42.0 | 43.5 | 45.0 | 48.0 | 50.0 |
| Stack (N on the drawing) | 60.0 | 60.0 | 60.0 | 60.0 | 61.4 | 62.3 |
| Frame size | 15.5" | 17.5" | 18.5" | 19.5" | 21.5" | 23" |
| Wheel size | 29" | 29" | 29" | 29" | 29" | 29" |
| Eff. seat tube angle | 73.8° | 73.8° | 73.8° | 73.8° | 73.8° | 73.8° |
The Atlanta Cycling difference
Specs matter. But so does how a bike feels when you ride it. Our team is here to help you choose the right size, understand the details, and get comfortable before your first ride.
When you buy from Atlanta Cycling, you're not just getting a box with a bicycle in it. You're getting a 30-day money-back guarantee, a complimentary baseline fit, lifetime basic adjustments, and real people who want you to love every mile.
“10/10 Editor's choice”
Faster with less fatigue than any other XC hardtail in test...Procaliber was still the smoothest bike here.
mbr.co.uk · Read the review
“What an XC race bike should be”
Procaliber offers a more comfortable ride than a traditional hardtail. It's noticeable right away. Ready to go uphill and down with no regard for anything except stopping to get on the podium.
pinkbike.com · Read the review
Four neighborhood stores. One shared passion.
Ansley. Alpharetta. Roswell. Vinings. Stop by, take a test ride, ask questions, and meet the people who will be here long after your first ride.