Gears & Transmission - chains, cassettes, bottom brackets, chainsets etc

^isaprocart^

Building your own Big Dummy or need to replace your time-served Xtracycle drivetrain? You can't do much better than the SRAM PC951 9 speed chain. It includes a gold 'Powerlink' which allows easy breaking and rejoining of the chain.

NOTE - one chain is not enough for a longbike! You will need 1 and 1/2 chains. Keep the bit left over as spares! These chains are delivered boxed with instructions.

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A dependable chain for all 6, 7 or 8 speed drivetrains. This is the same type/brand of chain as is supplied with all Xtracycle Freeradical kits.

NOTE - one chain is not enough for a longbike! You will need 1 and 1/2 chains. Buy 2 chains and keep the leftover as spares!

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A great value chainset for those building their own Surly Big Dummy or 18 Speed Yuba Mundo.

Triple chainset - 42/34/24 - silver 170mm cranks. Integral plastic chainguard.

Works with the Shimano UN54 square taper bottom bracket (below)

Picture shows black version - ours are SILVER!

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This delightful chainset is designed for singlespeed bikes, bikes with hub gears or bikes that use only a rear derailleur.

Included is an alloy chainring guard. This is essential for helping stop chain drop on singlespeed and hub geared bikes but also helps keep you best Farah slacks out of the chainring teeth!

Some bike science:
  • Power spline fitting
  • Chromoly chainring & crank bolts
  • 175mm crank length
  • 42 teeth
  • Pitch black anodising
  • 1 piece alloy construction

You will need a SRAM/Truvativ Power Spline bottom bracket to fit this chainset. We have a 118mm axle english cup version right here on this page.

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The standard Shimano BMX type freewheel is, according to cycle myth, made from Gorgonzola cheese. This becomes especially apparent when you try to use it under heavy load (on a cargo bike) and on hub gears. This is one reason we don't sell it. Instead we recommend this - a freewheel designed for the high torque and rigours of Trials riding. Here's what the nice guys in Petaluma, California say about their Trials Freewheel....

"We have designed a specific outer gear case that is beefier than our standard freewheel.  The case, like all our freewheels, is made out of 8620 steel, cased hardened and then electroless nickel plated.  In short, made to last.  The engagement system is a six pawl system yielding 72 points of engagement, double that of our standard freewheel.  Can this freewheel be used in a typical single speed non trials application?  Certainly."

We say, "very good good for fitting on Nuvinci Hubs that are fitted to Cargo Bikes." Only available in 18teeth. Made in USA

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Whatever you're building (Big Dummy perhaps?) this is a benchmark in value for money and high performance cassettes.
  • 11-32 cog range
  • Lightweight but robust
  • Suitable for 9 speed systems (but should fit most 8 speed Shimano hubs too)

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Shimano UN54 sealed cartridge bottom bracket for square taper cranks. Solid and dependable.

68mm shell - 118 length axle (English thread)

Buying a Surly Big Dummy Frameset? We can supply and fit this bottom bracket to a fully-prepped bottom bracket shell before we ship to you. If you'd like a different length axle please contact us and we can order one in for you. If you order these bits with a Big Dummy frame we will assume you want them fitting so if you don't want us to, just drop us a short e-mail when you have ordered.

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Shimano ES51 Splined bottom bracket for Shimano Octalink cranks only. Sealed mechanism with cartridge bearings - solid and dependable.

68mm shell - 118mm axle length (English thread)

Buying a Surly Big Dummy Frameset? We can supply and fit this bottom bracket to a fully-prepped bottom bracket shell before we ship to you. If you'd like a different length axle please contact us and we can order one in for you. If you order these bits with a Big Dummy frame we will assume you want them fitting so if you don't want us to, just drop us a short e-mail when you have ordered.

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This sealed bottom bracket with smooooth cartridge bearings will last a long time and it's stiff thanks to the splined nature of the axle which also keeps it light too.

It's ideal for bikes that work hard every day.

We have the perfect matching chainset for singlespeed, hub geared or 9x1 set up bikes elsewhere on this page.

118mm splined axle, English 68mm shell.

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For single chainrings - ie they will not be long enough to fit double or triple chainsets.

Ideal for if you are converting a double or triple chainset into a single ring chainset (for fixed gear, singlespeed or hub gear conversion!)

There are 5 bolts per pack - silver - with hex/allen key head

Superb quality

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Chain guards should fulfill TWO roles - they should prevent your trousers/skirt getting oily kak on them AND also keep your chain sealed from the elements. In reality most chain guards only do one of these - ie keep your keks clean!

 

The Hebie chainglider keeps your best Farahs clean AND also keeps the wonder that is your bicycle chain free from water and grit from everyday riding. Why is this so important? Well, when you ride everyday, the last thing you want is to have to spend ages in the garage each night cleaning and oiling your chain. Utility bikes should be ride and forget machines that require servicing at intervals rather than every week!

 

The chainglider from German stalwarts Hebie is easy to fit because it does not actually fit to the main frame of the bike. It simply sits around the chain and is magically supported by the chain itself. It is made of robust malleable black plastic and has a Hebie logo at the top of the guard.

 

This particular chainguard specifically fits bikes which have - a single rear cog (so singlespeeds or hub geared bikes)  THERE ARE THREE SIZES/TYPES:-
  • 38 teeth chainring with 18-22 teeth rear cog
  • 42-44 teeth chainring with 19-20 teeth rear cog
  • Rohloff Hub specific - 44tetth chainring with 15-17 teeth cog on the Rohloff (£47.00)

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Prevent that annoying scenario when you drop quickly and under pressure down onto the granny (inner) ring on your chainset and the chain flops off onto the bottom bracket shell.

Buy one of these simple little plastic/resin gizmos and that should happen less often (if at all).

Simple to fit - the part is flexible enough to to slip around the seat tube next to the point where your chain noramally sits on your smallest front chainring. Light enough to forget it's there.

3 sizes to fit different seat tube diameters available:

34.9mm (Yuba Mundo v.1 & v.2)
31.8mm
28.6mm

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