Bicycle Mechanics - From 27 to 650b with Paul Motolites.

Another 650b conversion.

Because I like pain I want to try converting a touring bike with canti bosses to 650b. I know this is impossible but is it?

http://www.paulcomp.com/motolite.html

These seem like they have the reach but I haven't seen them in person. I understand I'd need new cables + levers. That's fine.

Anyone tried this?

...I want to try converting a touring bike with canti bosses to 650b. I know this is impossible...

1) Sturmey-Archer
1a) Drum brake hubs (http://www.sturmey-archer.com/products/hubs/cid/1/id/54)

of course, I do have to ask, why would you want to convert this bike? One of the oft totted reasons for a 650b conversion is the increased tire clearance. A touring bike should have plenty of tire clearance, making this conversion somewhat superfluous.

I have seen motolites being used when going from 26" to 650B , it would seem to me any V brake would go down from a 27" to a 650b negating a expensive V brake like the Paul. If the Paul would reach would not any V brake also reach?

the shoe holder grips the round lever of the brake where it needs be,
just as it moves further up, the leverage goes down.
Paul's Comp. nice quality components made in California.

Why? Fender plus clearance and tire choices.

Why Paul? They have a really long range. Check them out. Shimano and Tektro have tiny slots for adjustment.

Look how close the brake pad is to the boss:

http://www.thebikeboutique.com/images/products/moto%20v%20brake.jpg

Now look at these:
http://bike.shimano.com/media/techdocs/content/cycle/EV/bikecomponents/BR/EV-BR-M590-2922_v1_m56577569830670736.pdf

I'll probably gain enough range to go 700c no problem. Even with unusually high bosses.

Why? Fender plus clearance and tire choices.

Why Paul? They have a really long range. Check them out. Shimano and Tektro have tiny slots for adjustment.

Do tell, what touring bike is this that doesn't have ample clearance for fenders and wider tires?

I don't think the Motolites will reach far enough up. You don't want the shoe collars up on the scalloped section. The Moto BMX (http://www.paulcomp.com/motobmx.html) brakes are supposed to allow exactly what you're trying to do. They're just the Motolites, without the scallops milled out.

I don't think the Motolites will reach far enough up. You don't want the shoe collars up on the scalloped section. The Moto BMX (http://www.paulcomp.com/motobmx.html) brakes are supposed to allow exactly what you're trying to do. They're just the Motolites, without the scallops milled out.


Perfect. Thanks. I'm going to give these a try.

The frame in question is a nishiki riviera gt.

I might be missing something here, but...

I seriously doubt this will work. In order to convert from 27" (630mm BSD) to 650B (584mm BSD) you will need to move the brakes down (630-584)/2, or 23mm - that is almost a whole inch! Unless the brake pads lined up with the 27" wheels are considerably more than an inch above the top of the pivot - I estimate at least 1-3/8" by looking at the Paul's brakes photos - then there cannot possibly be enough room to move the pads down to meet the 650B rims.

Converting to 700C would be easier. Also many many many more tire and rim choices.

LarDasse74 is correct. You would need to move the brakes down 23mm.
The canti studs will be to close to the rim for ANY canti or v to work.

700c would almost certainly be a better option, but drum brake is an interesting idea

Or, as long as you what to get into a complex project:

1. Drum brake or an IGH hub with a built-in brake in the rear
2. A new fork with disc brake bosses and a disc up front.

I don't think the Motolites will reach far enough up. You don't want the shoe collars up on the scalloped section. The Moto BMX (http://www.paulcomp.com/motobmx.html) brakes are supposed to allow exactly what you're trying to do. They're just the Motolites, without the scallops milled out.

No, the Moto BMX is designed for using larger wheels than the frame was designed for. For smaller wheels there is no difference between the Motolite and the Moto BMX.

I think that the pads will be too close to the pivot to brake properly.