CoachingAnswer

WHY DOES MY BUM HURT WHEN CYCLING?

By Anthony WalshRoadman CyclingUpdated 10 July 2026

ANSWER

Saddle pain is caused by pressure on soft tissue rather than the sit bones. A saddle that is too narrow, too wide, or tilted nose-up forces weight onto the perineum and inner thighs instead of the ischial tuberosities. Research by Schwarzer et al. shows that pressure mapping reduces perineal loading by 30-50% compared with choosing a saddle by feel. Proper bib shorts with a multi-density chamois, gradual mileage increases, and a professional bike fit resolve the problem for over 90% of riders.

KEY TAKEAWAYS

Sit bone width determines the correct saddle width — a mismatch is the leading cause of saddle pain.
Pressure mapping reduces perineal loading by 30-50% compared with saddle selection by feel alone.
Quality bib shorts with a multi-density chamois are non-negotiable for rides over 60 minutes.
Gradual mileage increases allow tissue adaptation — jumping from 30 to 100 km in a week guarantees soreness.

WHO THIS IS FOR

IS THIS YOU?

The new cyclist

You have just started riding and every session ends with you standing on the pedals because the saddle hurts too much to sit on.

The returning rider

You took months or years off the bike and your sit bones are protesting the reintroduction.

The long-distance rider with chronic discomfort

You can manage 90 minutes but anything beyond that becomes unbearable, and you suspect your saddle is the problem.

THE ROADMAN VIEW

Saddle pain is the number-one reason people stop cycling. That is a tragedy because it is one of the most fixable problems in the sport. The saddle is not supposed to hurt. If it does, something is wrong with the setup, not with you.

Start with width. Your sit bones have a measurable distance between them — typically 100-150 mm — and the saddle needs to support them. If the saddle is narrower than your sit bones, all your weight lands on soft tissue. If it is too wide, your inner thighs chafe against the edges. A bike shop can measure sit bone width in five minutes with a gel pad or pressure mat.

Then check tilt. Even two degrees of nose-up tilt drives pressure forward onto the perineum. Level or one degree nose-down is the starting point for most riders. After that, it is chamois quality and mileage progression. Cheap shorts with a flat foam insert will hurt regardless of saddle choice. And your body needs two to three weeks of regular riding to adapt to saddle contact — you cannot skip that phase.

EXPERT EVIDENCE

WHAT THE EXPERTS SAY

Dr Ulrich SchwarzerUrologist and saddle pressure researcher
Pressure mapping studies demonstrate that saddle width matched to sit bone spacing reduces perineal pressure by 30-50%. The critical variable is not saddle padding but saddle geometry — a well-shaped firm saddle outperforms a poorly shaped soft one in every measurable metric.
Phil BurtFormer Head of Physiotherapy, British Cycling
Saddle discomfort in new cyclists resolves in 85-90% of cases with three interventions: correct saddle width, proper short/chamois selection, and a graduated increase in ride duration. The remaining 10-15% typically have a pelvic asymmetry or flexibility limitation that requires a full bike fit.

PRACTICAL APPLICATION

DO THIS WEEK

Measure your sit bone width
Visit a bike shop with a pressure-sensitive pad or use corrugated cardboard at home. Sit on it in your riding position, measure the centre-to-centre distance of the two deepest impressions, and add 20-25 mm for road or 25-30 mm for a more upright position.
Check saddle tilt with a spirit level
Place a spirit level along the length of the saddle. Start dead level. If you slide forward during rides, tilt the nose up by one degree maximum. If perineal pressure is high, tilt one degree nose-down.
Invest in proper bib shorts
A multi-density chamois with seamless edges and antibacterial treatment is worth more than an expensive saddle paired with cheap shorts. Apply chamois cream to both skin and pad for every ride over 60 minutes.
Build saddle time gradually
Increase weekly ride duration by no more than 15-20% per week. Your skin, soft tissue, and sit bones need two to three weeks of consistent riding to adapt. Soreness in the first week is normal; soreness in the fourth week is a fit problem.

COMMON MISTAKES

WHAT CYCLISTS GET WRONG

MISTAKEChoosing a wider or softer saddle to fix pain.
FIXExtra padding compresses and spreads under load, increasing pressure on soft tissue. Width should match sit bones, and firmness should support rather than engulf.
MISTAKEWearing underwear beneath cycling shorts.
FIXUnderwear seams create friction points that cause chafing and saddle sores. Cycling shorts are designed to be worn directly against skin.
MISTAKELowering the saddle to reduce pressure.
FIXA saddle set too low causes excessive knee bend and shifts weight rearward, increasing sit bone pressure. Correct saddle height fixes both knee issues and pressure distribution.

FAQ

FREQUENTLY ASKED QUESTIONS

How long does it take to get used to a cycling saddle?

Most riders need two to three weeks of regular riding (three to four sessions per week) to adapt. If significant pain persists beyond four weeks, the saddle or position is wrong — not your body.

Should I use a saddle with a cutout?

A central cutout or channel reduces perineal pressure and is beneficial for riders who experience numbness or soft-tissue discomfort. Pressure mapping studies consistently show lower perineal loading with cutout designs.

Does saddle pain go away on its own?

Mild soreness in the first two weeks of cycling often resolves as tissue adapts. Persistent pain, numbness, or skin breakdown beyond three weeks indicates a fit or equipment problem that will not self-correct.

Can saddle pain cause long-term damage?

Chronic perineal pressure can cause pudendal nerve compression, leading to genital numbness. This is reversible in most cases when the pressure source is removed. A properly fitted saddle eliminates the risk.

Are women's saddles different from men's?

Women typically have wider sit bones and may benefit from saddles with a shorter nose, wider rear platform, and more generous central relief. However, sit bone width varies enormously within both sexes — measurement matters more than gender labelling.

Should I stand up on climbs to relieve saddle pressure?

Standing periodically during long rides is normal and reduces sustained pressure. But if you stand primarily to escape pain rather than to climb or accelerate, the saddle setup needs attention.