Frankenforks

There seems to be a surprising amount of interchangeability between the 32mm chassis forks from Rockshox, Fox and even Marzocchi. Here are some examples of frankenforks that people have put together:

It is also possible to swap the uppers and lowers between the various Fox 32mm stanchion forks. For example, you can use the v-brake lowers from a 2004 Fox with the uppers and internals from a 2010 Float RLC.

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Speakers

An often overlooked part of the electric guitar player's arsenal, but an extremely important part of anyone's tone.

24" air forks

There are very few air sprung forks for 24" wheels:

Dynamo hubs

Recently, dynamo hubs have been undergoing a revival of sorts, with a number of new (relatively) lightweight energy efficient models. Here's a brief summary of what's available as at 2014:

Magura MTS

Lauf fork

This is the 29er version and has an axle-to-crown measurement of 485mm and a 48mm offset/rake.  Weight is an amazing 990g but travel is only 60mm.

Short spokes

It's not easy to get spokes in the lengths that you need for kid's bike wheel builds, but there are a few options available: