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Old 03-14-10, 11:28 PM   #1
yogurtcox
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650b conversion 120mm rear spacing HELP

My girlfriend has a panasonic PT-5000 with 27 x 1 1/8 inch tires. We want to put fatter tires, but the fattest tires available are 27 x 1/4 inch. So, we were looking into getting a new wheel set. We were thinking 700c but then thought maybe with 650b we could fit fenders and fat tire with some new brakes.

The rear spacing on on her bike is 120mm and trying to find hub that takes a 5speed freewheel is nightmare, I know phil wood makes a freewheel hub that will work, but don't spend that much. I was wondering if a flip flop hub with a freewheel one side would work with a 5speed freewheel?

Thank you,

yogurt
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Old 03-15-10, 12:42 AM   #2
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Nope. The thread-on portion is too narrow (only room for 1 or 2 cogs). Not to mention, your dish would be radical and your chainline would be off.

Two words: donor wheel.
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Old 03-15-10, 01:30 AM   #3
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Thanks. I think i'm just going relace the old hubs to new rims
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Old 03-15-10, 06:50 AM   #4
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Yeah I think relacing the current hubs will be your best bet. Do you have rims in mind already? I recommend Velocity rims for 650b- I have a pair myself and they're outstanding.
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Old 03-15-10, 07:00 PM   #5
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yeah, I'm thinking the synergy rims would be the best. I'll post pictures once it's done.
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Old 03-15-10, 07:24 PM   #6
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1. Respace a 126mm hub. If your using a 5s freewheel there's more than enough room to remove 3mm from each side.

2. How would you get brakes to work on 650b wheel?

3. Go with 700's or stay with the 27's
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Old 03-15-10, 07:37 PM   #7
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Originally Posted by miamijim View Post

3. Go with 700's or stay with the 27's
700's have a nice large choice of tires. I'm using 38s on my Schwinn Mirada that originally was equipped with 650bs. Swapping a donor set was much more cost effective than lacing up a new set of rims. The Mirada sees street & light trail use. Handles like an oil tanker, but cushy.
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Old 03-15-10, 07:43 PM   #8
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700's have a nice large choice of tires. I'm using 38s on my Schwinn Mirada that originally was equipped with 650bs. Swapping a donor set was much more cost effective than lacing up a new set of rims. The Mirada sees street & light trail use. Handles like an oil tanker, but cushy.
What years your 650b Mirada? I vaguely remember Schwinn doing something like that back in he 80's.
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Old 03-15-10, 09:37 PM   #9
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2. How would you get brakes to work on 650b wheel?
If I choose to go with 650b wheels, I was looking at getting the dia compe mod 750 center pull brakes they have a 62mm to 78mm of reach.
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