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Hub drill size(6 posts)

Hub drill sizeDan Ida
Mar 10, 2001 5:22 PM
When sorting through shimano hubs, I notice two different sizes of drilled holes. Is there a standard drill size for 14 and 15 ga spokes? Is it the same for all manufacturers? If not, how does one identify the spoke gauge required for a particular hub? What's the best book to read about wheel building. I'm working from websites right now.
Bookgrz mnky
Mar 12, 2001 9:55 AM
Check out "The Bicycle Wheel" by Jobst Brandt, available for $21 at decent bike shops that carry books. I'ts not the only book but it's an easy read and has good info. It addresses lots of topics and debunks a slew of bike myths and legends.

You'll soon learn that there aren't a lot of well adopted standards in some aspects the bike industry and wheels is one of them. Rim diameter and axle length is about it - and even that has evolved over the years. Before long we may be using disc brakes on a "standard" road bike. Think about it - a new way to sell a ton more parts to the same people and you solve the rear wheel dish problem -- just like what's already happened MTB's. Special hubs, rims and spokes, new braking systems, etc. They've been common on tandems for years and once the weight issue is addressed we'll be there (Avid cable disc anyone?).
rear wheel dish?Brian B.
Mar 12, 2001 4:33 PM
Help me out here- how does adding a disc brake solve the wheel dish problem? Isn't that an issue caused by the offset of the cassette body versus the centerline of the hub axle/ rim?

-Brian B.
rear wheel dish?grz mnky
Mar 13, 2001 9:20 AM
Well, you're right, but think of this: you put the cassette on the RHS and the disc on the LHS and viola your flanges and rim are centered from the start. They're already doing it on MTBs.
Mar 13, 2001 1:21 PM
It seems to me that if you move the left flange towards the center you get a REALLY weak unstable rear wheel. The strongest wheels have the flanges as far apart as possible. Accomodating a 9 speed cassette created excessive tension on the drive spokes to pull the rim towards the center. That's why Bontager developed asymmetrically drilled rims. I don't know much about disc brakes though. What hub manufacturer is doing this?
TandemsSpoke Wrench
Mar 15, 2001 6:10 AM
Tandem rear hubs are typically 145mm OLD or, Santana and a few other tandem builders are using a whopping 160mm OLD rear hubs. Hub flanges are nicely spread apart for good bracing and the wheels have no dish at all.

Now, if you put a disk brake on your front wheel, you get to dish that one so you are back to where you started.