Sizing & Geometry · A2 Bikes
Find your fit. Then forget about it.
Every A2 comes in four sizes — and with free size exchanges, more front-end adjustability than any bike in its class, and a team of riders one email away, getting your size right is easier than it should be. Use the calculator below, then check the charts.
SP geometry & fit
A steep 78° seat-tube angle and race-tuned reach put you in a fast, sustainable aero position. Start with the size for your height — then dial it in with the adjustable cockpit.
| Measurement | Small | Medium | Large | XL |
|---|---|---|---|---|
| Body height | 5'3"–5'6" | 5'7"–5'10" | 5'11"–6'2" | 6'2"–6'5" |
| Seat tube length (A) | 50 cm | 52 cm | 54 cm | 58 cm |
| Seat tube angle (B) | 78° | 78° | 78° | 78° |
| Top tube length (C) | 46.9 cm | 49.9 cm | 52.8 cm | 55.8 cm |
| Head tube length (D) | 5.3 cm | 8.75 cm | 12.3 cm | 15.75 cm |
| Head tube angle (E) | 73° | 73° | 73° | 73° |
| Chainstay length (F) | 41 cm | 41 cm | 41 cm | 41 cm |
| Wheelbase (G) | 94 cm | 97.2 cm | 100.5 cm | 103.8 cm |
| Front center (H) | 54 cm | 57.3 cm | 60.5 cm | 63.8 cm |
| BB drop (I) | 7 cm | 7 cm | 7 cm | 7 cm |
| Stack (J) | 46 cm | 49.3 cm | 52.7 cm | 56 cm |
| Reach (K) | 37.1 cm | 39.4 cm | 41.6 cm | 43.9 cm |
| Wheel size | 700c | 700c | 700c | 700c |
Rogue geometry & fit
A balanced endurance-road position — quick enough to race, relaxed enough for all day. Every Rogue is spec'd with size-appropriate stem and crank lengths straight out of the box.
| Measurement | Small | Medium | Large | XL |
|---|---|---|---|---|
| Seat tube (A) | 462 | 482 | 510 | 528 |
| Seat tube angle (B) | 74° | 73° | 73° | 72° |
| Head tube length (C) | 115 | 130 | 145 | 160 |
| Head angle (D) | 72° | 72° | 73° | 73° |
| Effective top tube (E) | 528 | 540 | 552 | 567 |
| BB drop (F) | 41 | 41 | 41 | 41 |
| Chainstay length (G) | 410 | 410 | 410 | 410 |
| Stack (H) | 521 | 535 | 550 | 567 |
| Reach (I) | 378 | 381 | 386 | 390 |
| Component | Small | Medium | Large | XL |
|---|---|---|---|---|
| Stem | 90 | 90 | 100 | 110 |
| Crank | 165 | 170 | 172.5 | 175 |
Between sizes?
On the border? Size up.
We generally recommend sizing up for comfort — unless you're an experienced triathlete chasing an aggressive aero position on the SP, in which case staying down (or sizing down, with a professional fit) can be the faster choice.
Inseam breaks the tie
A longer-than-average inseam for your height pushes you toward the larger size; a shorter one toward the smaller. The calculator above factors this in automatically.
Outside 5'3"–6'5"?
Talk to us — we'll personally help you find a setup that fits, or point you to the right option.
Adjustability is the real fit story
Your frame size is the starting point, not a straitjacket. Every SP ships with a wide-range adjustable cockpit and seatpost, so the bike moves to you — and if the size still isn't right when it arrives, exchanges are free within 30 days.
SAGS adjustable cockpit
Fore/aft pad range to tune your aero position without a new bar.
SASP seatpost travel
Saddle height and setback dialed in across a huge window.
Free size exchanges
If the fit isn't right when it lands, we swap it — on us.
Still deciding?
Take the 60-second quiz to find your bike and size, or get a human opinion from our fit team.