Specialized Tarmac SL9 Sizing Guide: How to Get the Perfect Fit
TL;DR
The Tarmac SL9 comes in 8 sizes (44-61). Most UK riders between 170-180 cm will fit a 54 or 56. Specialized's geometry is race-oriented with a low stack-to-reach ratio, so if you are between sizes, size down for aggressive racing or size up for comfort. Always book a Body Geometry Fit at a Specialized dealer for the best results.
Tarmac SL9 Size Chart
| Size | Rider Height | Stack (mm) | Reach (mm) | Standover (mm) |
|---|---|---|---|---|
| 44 | 155-160 cm | 487 | 364 | 695 |
| 49 | 160-168 cm | 509 | 374 | 726 |
| 52 | 168-174 cm | 527 | 384 | 750 |
| 54 | 174-178 cm | 540 | 390 | 770 |
| 56 | 178-184 cm | 556 | 396 | 790 |
| 58 | 184-190 cm | 576 | 404 | 815 |
| 61 | 190+ cm | 600 | 415 | 845 |
Understanding Stack and Reach
Stack is the vertical distance from the bottom bracket to the top of the head tube. A higher stack means a more upright position. Reach is the horizontal distance, determining how stretched out you feel. The SL9 has a slightly longer reach than the SL8 at each size, so riders upgrading should be aware they may need a shorter stem.
How to Measure Yourself
- Inseam: Stand barefoot against a wall. Place a book between your legs and measure from the floor to the top of the book.
- Height: Stand straight against a wall, measure from floor to the top of your head.
- Arm span: Measure fingertip to fingertip with arms outstretched.
- Torso length: Measure from the saddle contact point of your pelvis to the notch at the base of your throat.
Between Sizes? Here's What to Do
If you fall between two sizes (e.g., 176 cm puts you between 54 and 56):
- Size down (54) if you race, want a more aggressive position, or prefer a shorter wheelbase for handling.
- Size up (56) if you ride long sportives, have a longer torso, or want a more comfortable ride.
A shorter stem (90mm instead of 110mm) can make a slightly large frame work well. Going too small is harder to correct.
Body Geometry Fit
Specialized dealers across the UK offer Body Geometry Fit sessions (approximately £150-250). This is the gold standard for bike fitting and covers:
- Foot alignment and cleat position
- Saddle height and fore/aft position
- Handlebar reach and drop
- Saddle pressure mapping
For a bike costing £5,000-14,000, a professional fit is an essential investment.
SL9 vs SL8 Geometry Changes
The SL9 has a marginally longer reach at most sizes (2-4mm) and a very slightly lower bottom bracket. This gives the SL9 better high-speed stability compared to the SL8 without sacrificing climbing performance. Riders upgrading from an SL8 in the same size may want to swap to a 10mm shorter stem.
Recommended Setup by Riding Style
| Style | Stem Length | Spacers | Saddle Setback |
|---|---|---|---|
| Racing | 100-120mm | 0-10mm | Neutral |
| Sportive | 90-110mm | 15-25mm | 5mm back |
| Climbing | 100-110mm | 5-15mm | Neutral |
Shop all Specialized Tarmac models at ebikesandgear.co.uk with free UK delivery on orders over £50.
FAQ
What size Tarmac SL9 for a 5'10" rider?
At 5'10" (178 cm), you typically fit a 56. If you have shorter legs and a longer torso, a 54 with a longer stem may work better. A Body Geometry Fit will confirm the ideal size.
Is the SL9 geometry different from the SL8?
Slightly. The SL9 has 2-4mm more reach and a marginally lower bottom bracket at most sizes, giving improved stability at high speed.
Can I return a wrongly sized bike?
Most UK retailers including ebikesandgear.co.uk offer exchanges within 30 days for unridden bikes. Always check the specific returns policy before purchasing.
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