Domovoi

So, the frame spacing on my bike is 145mm, that means the OLD of the hub I need is 145 too, right? Well I'm replacing the wheels and the hub I wanted to get for it comes in (at the largest) 135mm, is there no way I can use that hub?

On an unrelated note, is the radius for all rims the same? (Sorry, figured since I was already typing out this message I might as well save myself some time and effort googling)

stausty

1. You can put any hub into dropouts as long as the hub is narrower than the dropouts. You'll need a bunch of spacers to make up the difference. What are you riding that has a rear spacing of 145 mm?

2. Different rims have different radii. Really, it depends where you are measuring - is this for tires or for spokes? Different rims are different thicknesses, so they'll take different length spokes for the same hub. The outer radius - the one that matters for tire sizes - is the same if you have wheels that are the same official size. A 700c single-wall rim and a 700c Deep V will take different spokes but the same tire.

Domovoi

Thanks for the response,
It's an early 90s Trek 2300. It's for the hubs, my lbs said they'd order the spokes that fit, I just wasn't sure if there were any compatibility issues between different hubs/rims. And using spacers seems pretty straightforward, but just in case, anything I should know about using them? Thanks again

tatfiend 

Check your measurements as 145mm is not a standard width. Your Trek should be 130mm maximum as a road bike frame. This has been standard at least since 8 speed road freehubs were introduced. Measure the inside distance between dropouts with the rear wheel removed.

HillRider

I'll bet that's the OP's error, Dropout spacing is measured between the inside faces of the dropouts and I expect he measured outside to outside.

145 mm dropout spacing is common on tandems but very rare on single road frames and Trek has never made a single road frame with that dropout width.

The radius for all 700c rims is the same to the tire bead set. It is not the same to the spoke nipple bed so spokes have to be chosen to match the particular rim, hub and lacing pattern you use. DT and Sheldon Brown both have rim and hub data bases on their web sites that let you choose the correct length spokes.

Domovoi

You're right, I fail at measuring, I suppose I measured outside to outside last time but in any case, yes, it's 130, and they sell a 130mm hub, that's perfect, thanks guys. Oh, and there's nothing I have to worry about as far as ordering a rim for my hub goes(just a 700c rim to fit with 700c tires and my lbs said they'd take care of the spokes), right?

dabac

In general the hub doesn't care which rim it's laced to, as long as spoke lengths match up. From a practical standpoint it's advisable, but not required, that rim and hub are drilled for the same number of spokes.

I suppose one could get into trouble somehow if one were to rebuild a wheel meant for paired spoking into a traditional pattern, of if one wanted to use stuff intended for those extra-thick(aluminum?) spokes.

stausty

You should be set. Pick out a rim and a hub and the shop (or you) can look up the correct spoke lengths to use for that pairing. Any 700c tire will be the right diameter for the rim. You do have to choose the correct width of tire - some rims will handle a fatter tire, but not all frames have the space to accommodate a really wide tire. A quick question at the LBS or just matching what is on the other wheel will tell you exactly which tire size to order.

Domovoi

Perfect. You guys are brilliant, thanks for all the help.