Sesh Frame

Built for smaller riders. Ready for real mountain terrain.

For riders under 5’7″, finding a mountain bike that truly fits has become harder as more bikes grow longer and less proportional. The Lenz Sport Sesh is built to solve that problem with geometry designed specifically for smaller riders. Available in 27.5 or 29er configurations and offered in Small and Extra Small, the Sesh gives smaller riders a bike that fits correctly, climbs efficiently, and stays composed when the trail turns steep and technical.

Mountain Bikes for small riders

Most mountain bikes for smaller riders are scaled-down versions of larger bikes. The Sesh is not. Its geometry is designed around the needs of shorter riders, with more standover clearance, a shorter reach, and a compact cockpit that creates better range of motion between feet and handlebar. That fit translates directly to ride quality. With 5 inches of plush travel, a short chain stay, a steep seat angle, and a slack head angle, the Sesh is responsive on technical climbs and stable when the trail points down.

Key benefits

  • Designed specifically for riders under 5’7″
  • Available in 27.5 or 29er builds
  • Offered in Small and Extra Small sizes
  • Fits tires from 2.3″ to 3.0″ for broad setup flexibility
  • 5 inches of rear travel for a supple, controlled ride
  • More standover clearance and shorter reach for better fit
  • Compact cockpit for confident handling and freedom of movement
  • 3:1 rear suspension leverage ratio for a highly responsive feel

Geometry that works for smaller riders

The Sesh takes the proven foundation of the Behemoth and adapts it for smaller bodies and more technical riding. Added standover clearance and shorter reach improve fit, while the compact cockpit gives riders more room to move the bike underneath them without feeling stretched out.

Traction and versatility where it matters

The Sesh can be set up with tires from 2.3″ to 3.0″, giving riders the freedom to tune the bike for different terrain and riding styles. Larger tires roll more smoothly over rough ground and add traction in loose conditions, sand, and technical climbs.

Plush suspension with responsive control

A 3:1 rear suspension leverage ratio gives the Sesh an exceptionally supple and responsive ride feel. Combined with 5 inches of travel, it helps the bike stay active in rough terrain while maintaining control and composure through repeated hits.

Built to climb and descend well

The steep seat angle supports efficient climbing, while the slack head angle adds confidence on descents. A short chain stay helps the bike loft over rocks, roots, and drops, making the Sesh playful and precise without giving up downhill stability. On the trail, the Sesh is built to help smaller riders move confidently through technical terrain. The compact fit supports better body positioning for pumping trails, carving corners, climbing technical sections, and carrying speed downhill with more control and stability.
  • 29er or 27.5 inch wheel size options (mixed wheel too)
  • 5 inch travel with 3.2 to 1 leverage ratio
  • 140mm fork optimal (130mm or 150mm okay too)
  • 12x148mm rear through axle.
  • 30.9mm seatpost diameter
  • Stealth Routing for dropper post
  • 1x drivetrain specific design
  • Color? The sky is the limit! Click here for options and ideas
Please note! All Lenz Sport frames are hand-made in Colorado. They are not factory built on an assembly line. Designs evolve iteratively, per Devin’s expertise and judgement. Specifications may vary, and are subject to change without notice.
 Lenz Bike Geometry Comparison Chart- compare the Sesh, Mammoth, Behemoth, and Lunchbox

Our frame size is now the Reach measurement. We no longer use size labels since they are irrelevant. *Focus on rider height, reach, RAD, and Standover (SO) when choosing size. RAD = Height in mm times .447. Click here for more information on Ridelogic frame sizing and to submit measurements, or come into our shop for a fit. Once you nail down Reach and Standover, choose your bike based on how much travel you want.
MODELSeshSeshMammothBehemothLunchboxMammoth Behemoth Lunchbox MammothBehemothLunchoxMammothBehemoth LunchboxMammoth BehemothLunchbox
REAR TRAVEL130130110140160110140160110140160110140160110140160
FRONT TRAVEL140140120-140150-160170-180120-140150-160170-180120-140150-160170-180120-140150-160170-180120-140150-160170-180
RIDER HEIGHT 4’10’-5’3″ 5′-5’4″ 5’2″-5’6″5’2″-5’6″5’2″-5’6″ 5’5″-5’10”5’5″-5’10” 5’5″-5’10” 5’10”-6’1″ 5’10”-6’1″ 5’10”-6’1″6’0″-6’3″6’0″-6’3″ 6’0″-6’3″ 6’4″-6’8″ 6’4″-6’8″ 6’4″-6’8″ 
Frame Size:
REACH
 395 415420 420 420 430 430 430 440 440 440 460460 460 475 475 475
STACK 610 610625 630 634625 630 635635 640 645 645650 655655 660 665
RAD690-760720-780720-790740-800740-800745-805745-805745-805760-820760-820760-820780-860780-860780-860850-920850-920850-920
SO 690 695690 685 705 690 695 710710 730 750 720740 760745 765 785
HA 65.5 65.565 64.5 64 65 64.5 6465 64.5 64 6564.5 6465 64.5 64
TT 565 584575 575 575 594 594 594610 610 610 630630 630650 650 650
BB – 3″tire 340 340340 350 360 340 350 360340 350 360 340350 360345 355 360
BB – 2.6″tire330330330340350330340350330340350330340350335345350
BB – 2.4″tire320320320330340320330340320330340320330340325335340
HT 102 102102 102 102 102 102 102115 115 115 127127 127140 140 140
CS-29 422 422422 422 422 422 422 422422 422 422 422422 422422 422 422
CS-27.5 412 412412 412 412 412 412 412412 412 412 412 412 412412 412 412
SA 75 7577 77 76.5 77 77 76.577 77 75.5 77 77 75.577 75.5 75.5
WB 1130 11401180 1190 1200 1200 1210 12201215 1225 1235 12351245 12551255 1265 1275

Description

Built for smaller riders. Ready for real mountain terrain.

For riders under 5’7″, finding a mountain bike that truly fits has become harder as more bikes grow longer and less proportional. The Lenz Sport Sesh is built to solve that problem with geometry designed specifically for smaller riders.

Available in 27.5 or 29er configurations and offered in Small and Extra Small, the Sesh gives smaller riders a bike that fits correctly, climbs efficiently, and stays composed when the trail turns steep and technical.

Mountain Bikes for small riders

Most mountain bikes for smaller riders are scaled-down versions of larger bikes. The Sesh is not. Its geometry is designed around the needs of shorter riders, with more standover clearance, a shorter reach, and a compact cockpit that creates better range of motion between feet and handlebar.

That fit translates directly to ride quality. With 5 inches of plush travel, a short chain stay, a steep seat angle, and a slack head angle, the Sesh is responsive on technical climbs and stable when the trail points down.

Key benefits

  • Designed specifically for riders under 5’7″
  • Available in 27.5 or 29er builds
  • Offered in Small and Extra Small sizes
  • Fits tires from 2.3″ to 3.0″ for broad setup flexibility
  • 5 inches of rear travel for a supple, controlled ride
  • More standover clearance and shorter reach for better fit
  • Compact cockpit for confident handling and freedom of movement
  • 3:1 rear suspension leverage ratio for a highly responsive feel

Geometry that works for smaller riders

The Sesh takes the proven foundation of the Behemoth and adapts it for smaller bodies and more technical riding. Added standover clearance and shorter reach improve fit, while the compact cockpit gives riders more room to move the bike underneath them without feeling stretched out.

Traction and versatility where it matters

The Sesh can be set up with tires from 2.3″ to 3.0″, giving riders the freedom to tune the bike for different terrain and riding styles. Larger tires roll more smoothly over rough ground and add traction in loose conditions, sand, and technical climbs.

Plush suspension with responsive control

A 3:1 rear suspension leverage ratio gives the Sesh an exceptionally supple and responsive ride feel. Combined with 5 inches of travel, it helps the bike stay active in rough terrain while maintaining control and composure through repeated hits.

Built to climb and descend well

The steep seat angle supports efficient climbing, while the slack head angle adds confidence on descents. A short chain stay helps the bike loft over rocks, roots, and drops, making the Sesh playful and precise without giving up downhill stability.

On the trail, the Sesh is built to help smaller riders move confidently through technical terrain. The compact fit supports better body positioning for pumping trails, carving corners, climbing technical sections, and carrying speed downhill with more control and stability.

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$2,650.00

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