Tire pressure is the simplest performance and safety adjustment on your Harley-Davidson Fat Bob 114 — 36 PSI front / 40 PSI rear for solo riding.
Check pressures cold (before riding) at least weekly. A tire just 5 PSI low handles worse, wears faster, and runs hotter.
Harley-Davidson Fat Bob 114 quick service specs
| Item | Specification |
|---|---|
| Engine oil | 20W-50 |
| Oil capacity | 4.7 liters |
| Oil change interval | 5000 miles |
| Chain slack | See owner’s manual |
| Spark plug | 6R12 |
| Tire pressure (F/R) | 36 PSI front / 40 PSI rear |
| Battery | 12V 17.5Ah 310CCA AGM |
How to check and adjust tire pressure, step by step
- Check when cold — ride less than a mile or wait 3+ hours after riding.
- Remove the valve cap and press the gauge squarely onto the valve stem.
- Read the pressure and compare to 36 PSI front / 40 PSI rear (solo).
- Add air in short bursts or bleed with the gauge’s relief valve to hit the target exactly.
- Re-check both tires and refit the valve caps finger-tight.
- Inspect tread and sidewalls for cuts, bulges, or embedded stones or nails.
Common mistakes to avoid
- Checking hot — heat raises pressure, so you’ll underinflate.
- Trusting gas-station gauges — they take abuse; carry your own quality gauge.
- Ignoring the rear — it carries the load and needs the extra 4 PSI.
FAQ
Should I run different pressures two-up?
Yes — add a few PSI rear (see your manual’s loaded spec).
How much does temperature matter?
About 1 PSI per 10°F. Set pressures for the coldest part of your riding day.
Can I use the max pressure on the sidewall?
No — that’s the tire’s maximum, not your bike’s spec. Use the Harley-Davidson numbers.
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Dan Heiman
Writer at Helmet Today, covering helmet reviews, fit and riding safety.
