Questions for tech experts

[ianfra]

I am trying to help a young Thai student who is doing some work with wheels and frames and I need the following questions answered:


1. are dropouts standard size? (i.e. size of spindle they take) ......(My answer is yes)
2. Is the distance between dropouts standard? (i.e. can any wheel fit on any bike, within reason) .......... We're talking modern road bikes here
3. Is the hub flange size important? (makes a difference to spoke length)
4. Is the hub length important? (makes a difference to how dished the wheel is)
..........................This is the length between the hubs before the cassette (apparently)

Sorry for the questions, can't quite get my head around them and I'm not sure what the kid is doing!!!!

 

[RDV4ROUBAIX]

I am trying to help a young Thai student who is doing some work with wheels and frames and I need the following questions answered:


1. are dropouts standard size? (i.e. size of spindle they take) ......(My answer is yes)

Yes, 10mm rear 9mm front

2. Is the distance between dropouts standard? (i.e. can any wheel fit on any bike, within reason) .......... We're talking modern road bikes here

130mm for newer bikes, 126mm for older ones.

3. Is the hub flange size important? (makes a difference to spoke length)

Larger flanges make for shorter spokes, so does deeper rims. You'll find larger flanges with track hubs and older road hubs. Hub dimensions and the ERD (effective rim diameter) of the rim determine your spoke length.

4. Is the hub length important? (makes a difference to how dished the wheel is)
..........................This is the length between the hubs before the cassette (apparently)

It's flange spacing, proper dishing is a universal thing with geared hubs regardless of hub dimensions. Rear hub flanges are usually set about 20mm narrower than the front.

Sounds like you're preparing to build wheels from scratch, if so a great reference is Sheldon Brown's site and Damon Rinard's Spocalc... http://sheldonbrown.com/rinard/spocalc.htm

 

[ianfra]

Manythanks, very helpful!!