⛳️ Choosing between the Ventus, TR, and VeloCore+? Use the Ventus Shaft Guide

💚 💚 💚 Assembled Driver shafts with adapter tip installed - choose your custom build!

🎯 Find Your Perfect Shaft in 2 Minutes — Take the Quiz →
Flex and weight by swing speed

Golf shaft flex chart

Find the right flex and shaft weight for your driver and irons. Enter your swing speed or carry distance, or use the full chart below.

See the full chartShop golf shafts
4.9 from 73,000+ reviewsFree fitting helpFamily-owned since 1991
Flex finderEnter your speed or carry
mph

Driver swing speed gives the most accurate result.

Shaft flex chart for drivers and irons

Find your row by driver speed, driver carry or 7-iron carry. Fairway wood and hybrid shafts usually match your driver flex: match your fairway woods and hybrids.

Golf shaft flex and weight by swing speed and carry
FlexDriver and woodsIrons
Swing speedCarryShaft weight7-iron carryShaftWeight
Ladies (L)Under 70 mphUnder 160 yds40 to 50 gUnder 100 ydsGraphite45 to 60 g
Senior (A)70 to 80 mph160 to 185 yds45 to 55 g100 to 120 ydsGraphite55 to 70 g
Regular (R)80 to 95 mph185 to 220 yds50 to 60 g120 to 145 ydsGraphite or light steel65 to 105 g
Stiff (S)95 to 105 mph220 to 240 yds60 to 70 g145 to 160 ydsSteel105 to 125 g
X-Stiff (X)105+ mph240+ yds70 to 80 g160+ ydsSteel120 to 130 g
Tour X-Stiff (TX)110+ mph255+ yds70+ gIrons: use the X-Stiff row

Driver speeds come from the shaft makers’ charts for the driver shafts we carry, and carry runs about 2.3 yards per mph. Flex isn’t standardized, so brands run a little different. With an older, weaker-lofted 7-iron, lean one row firmer.

Shop driver shaftsShop graphite iron shaftsShop lightweight iron shaftsShop all iron shafts

What L, A, R, S, X and TX mean

Project X uses numbers instead of letters, so each step shows its Project X match.

  1. L

    Ladies

    The softest flex, for the slowest swings.

    Project X 4.0
  2. A

    Senior

    Also called Amateur. Soft, with a higher launch.

    Project X 5.0
  3. R

    Regular

    The most common flex for everyday golfers.

    Project X 5.0 or 5.5
  4. R+

    Firm Regular

    Between Regular and Stiff, on brands that make it.

    Project X 5.5
  5. S

    Stiff

    For faster swings and quick transitions.

    Project X 6.0
  6. X

    X-Stiff

    For fast, aggressive swings.

    Project X 6.5
  7. TX

    Tour X-Stiff

    Firmer than X, for tour-level speed.

    Project X 7.0

Project X 6.0 plays a little firmer than many brands’ Stiff. Project X flex codes explained

Shaft weight by flex

Flex is how much the shaft bends. Weight changes how fast you can swing it and how steady it feels.

  • Lighter adds speed and launch. Best for smooth tempos and slower swings.
  • Heavier feels steadier and tightens your misses. Best for quick transitions and faster swings.
  • Not sure? Start in the middle of your range. Losing distance: go lighter. Hooking or ballooning: go heavier or firmer.

Driver shaft weight

  • L40 to 50 g
  • A45 to 55 g
  • R50 to 60 g
  • S60 to 70 g
  • X70 to 80 g

Iron shaft weight

  • L45 to 60 g
  • A55 to 70 g
  • R65 to 105 g
  • S105 to 125 g
  • X120 to 130 g
A golfer holding his finish after a full swing on the course

If you’re between two flexes

Go by your tempo. Two golfers with the same speed can fit different flexes.

Smooth, even tempoSofter flex, lighter weight

A smooth swinger at 95 mph often prefers Regular.

Quick, aggressive transitionFirmer flex, heavier weight

A quick swinger at the same 95 mph often prefers Stiff.

How to tell your flex is off

Too stiff: the ball starts right of the target and stays right for a right-handed golfer.
Too stiffLow flight, starts right and stays right for a right-handed golfer, and a dead feel.
Too soft: the ball curves left of the target for a right-handed golfer.
Too softHigh, spinny flight, hooks, and contact that changes from swing to swing.
Swing speed under 85 mph
40 to 55 gDriver shaft, in Senior or Regular flex
55 to 85 gGraphite iron shafts

Shaft weight for slower swing speeds

With a slower swing, dropping weight usually helps more than dropping flex. A lighter shaft adds speed and launch without feeling whippy.

Senior flex driver shafts guideGraphite vs steel iron shafts

Shaft flex FAQ

All golf shaft guides
What flex shaft do I need for my swing speed?

Under 70 mph: Ladies. 70 to 80 mph: Senior. 80 to 95 mph: Regular. 95 to 105 mph: Stiff. 105 mph and up: X-Stiff, with Tour X-Stiff (TX) from about 110 mph on brands that make it. These ranges come from the shaft makers’ charts for the driver shafts we carry.

What flex should I use for a 90 mph swing speed?

Regular flex. At 90 mph you’re in the middle of Regular (80 to 95 mph), with a driver shaft around 50 to 60 grams. If you’re closer to 95 mph and have a quick transition, try Stiff.

What does X flex mean on a golf shaft?

X means X-Stiff, the firmest common flex. It’s built for fast, aggressive swings of about 105 mph and up with the driver, or a 7-iron that carries 160 yards or more.

What is TX flex?

TX is Tour X-Stiff, one step firmer than X. It’s made for tour-level speed, from about 110 to 115 mph and up depending on the brand. Most fast swingers still fit X or Stiff.

How do I find my flex if I don’t know my swing speed?

Use carry distance. A driver carries about 2.3 yards for every mph of swing speed, so a 200-yard carry is about 87 mph, which is Regular flex. For irons, use your 7-iron carry with the iron chart on this page.

Should my irons and driver be the same flex?

Usually, yes. Your iron and driver speeds rise and fall together, so the same flex is the normal starting point. If your irons and driver feel different, ask Griffin, our online fitter.

Is a 6.0 shaft stiff?

Yes. Project X 6.0 is Stiff, for about 95 to 105 mph, and it plays a little firmer than many brands’ Stiff. 5.5 is Firm Regular and 6.5 is X-Stiff.

Are shaft flexes the same between brands?

No. There’s no industry standard, so one brand’s Stiff can feel like another brand’s Regular or X-Stiff. Go by each maker’s own chart when a product lists one, and ask us if two shafts disagree.

What happens if my shaft is too stiff or too soft?

Too stiff often means low flight, shots that drift right for a right-handed golfer, and a harsh feel. Too soft often means a high, spinny flight, hooks and inconsistent contact.

What shaft weight should a senior golfer use?

Usually lighter: about 40 to 55 grams in the driver and graphite irons around 55 to 70 grams. A lighter shaft helps add speed and launch. Our senior flex driver shafts guide has picks.

Measuring a shaft to length in the Grips4Less build shop
Our build shop in Chatsworth, California
Griffin, the Grips4Less online fitter

Ask Griffin, our online fitter

Tell him your swing speed or carry, the shaft you play now and what your shots do. He’ll match a flex, a weight and a shaft we carry.

Free online fitting

Shop shafts by club

Project X HZRDUS Black driver shaftDriver and fairway shaftsEvery brand, weight and flexShop Adapter tip for an assembled driver shaftAssembled driver shaftsAdapter tip and grip installed, ready to playShop Fujikura Ventus hybrid shaftsHybrid shaftsMatch your driver flexShop True Temper Dynamic Gold steel iron shaftIron shaftsSteel and graphite, or let us install them with RetrofitShop

Written by the Grips4Less team in Chatsworth, California. Driver swing speed ranges come from the shaft makers’ charts for the driver shafts we carry. Reviewed . More guides: all golf shaft guides.

Sources
  • Shaft makers’ published swing speed ranges by flex for the driver shafts we carry, checked October 2026.
  • TrackMan LPGA Tour averages, 2024 (driver 96 mph and 223 yards carry; 7-iron 78 mph and 143 yards), via Golf Monthly.
  • TrackMan PGA Tour 7-iron averages, 2023 (92 mph and 176 yards carry), via Golf Monthly.
  • Project X flex codes, Grips4Less.
Back to top