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Recumbent gearing calculator

Wheel diameterWheel size:
Front chainring(s): Crank length:
Front transmissionNone:
Schlumpf DriveMountain-Drive:     Speed-Drive:     HighSpeed-Drive:
Pinion gearboxP1.12:     P1.18:
Efneo GTRO (3-speed):
Rear cassetteCassette:
- 		Raw gear: -
~=170mm: -

SRAM 3x7 / Dual-Drive: -
~=170mm: -
14-sp Rohloff Speedhub 500/14 Cog: -
~=170mm: -
3x3 NINE Cog: -
~=170mm: -
7-8sp Internal Cog: SRAM S7: -
Shimano Nexus-7: -
Shimano Nexus Inter-8: -
Shimano Alfine-11: -
Nuvinci N360: -
Sturmey: -
Single-speed: -
© 2003-2024 Hugh Kern, All rights reserved.

Classifieds

gears & shifting

PBW

Sunday Service: Shifting

Come out and learn about adjusting your own shifting.

Enjoy beautiful, crisp shifting. Eliminate pesky trips to a bike shop to get rid of that clunking. Take charge of your handlebars. We'll show you how to do all this and more. Covering twist shifters, bar-ends, internally geared hubs, as needed.

Caffeine and morning snacks provided. Bring a shifting conundrum for our version of Stump the Chumps. Go for a ride on the beautiful American River Trail afterwards.

Where: 1114 C Street, Sac'to.
Cost: FREE

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PBW
Sunday Service: Chains

Come out and learn about chains.

When to lube and how. Lube options. How to measure the wear on your chain. How to open quick-links (power links). How to use a chain tool.

We'll show you how to do all this and more concentrating on conventional multi-speed bike chains.

Caffeine and morning snacks provided. Bring a chain conundrum for our version of Stump the Chumps. Go for a ride on the beautiful American River Trail afterwards.

Where: 1114 C Street, Sac'to.
Cost: FREE

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PBW
recumbent trike, tubes

PBW

Sunday Service: Flats
Never fear going out again. Have confidence in your patch kit and your patching technique! Meet a goathead / puncture-vine and know your enemy. Morning snacks and caffeine provided. Workshop begins when the caffeine kicks in. Bring a flat tube to fix and tire conundrums and puzzles. Go for a ride on nearby American River Trail afterwards
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PBW

PBW

Sunday Service: Wheels

Wheels - This is the ONLY workshop of the year on wheels. It is a bit on the technical side: to satisfy the need for more knowledge.

How to build a wheel; true a wheel; make it round; calculate spoke lengths; smooth out bumps inside your drum brake. When can't a wheel be saved? Why are good spokes important? How and why to dish a wheel. How to make or true an unconventional (single-sided) wheel. Replacing wheel bearings.

Come with a thirst to learn.

Caffeine and morning snacks provided. Workshop starts when the caffeine kicks in. Cost: FREE

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PBW
recumbent trike

PBW

Sunday Service: Drivetrain DIY

Explore the elements of a tricycle drivetrain from the pedals through the cranks, chain, rear cog or cassette, and into the wheel.

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PBW
recumbent trike, gears & shifting

FSA, Patterson, Schlumpf, PBW

Sunday Service: Schlumpf and Patterson
We're all familiar with internally geared hubs...
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FSA, Patterson, Schlumpf, PBW
Catrike Trail E-Cat with accessories
Catrike Trail with Alfine-8 wheel, Racktime rack and basket, and special accessory-mounts.

A Catrike Trail E-Cat accessorized with a Shimano Alfine-8 drivetrain upgrade, Racktime rear rack with integrating basket, phone-mount, and extra mirror using AlphaBENT accessory mounts.

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10 Top Reasons to add electric-assist to your Catrike with a Neodrive Z20
Catrike Dumont with Neodrive Z20 electric-assist

10 solid reasons to add electric-assist to your Catrike with a Neodrive Z20 hub-motor.

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Hand-cycling for Health
HP Velotechnik Gekko-26 hand-cycle recumbent trike
Hand-cycling is vigorous full-body exercise that builds upper body strength. HP Velotechnik's new Hands-On Cycle is available for the Gekko-26 model with a weight rating to 320lb.
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Employment Opportunities at AlphaBENT
Jobs Listings, Help Wanted, Positions Available
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