LBS says no Dyno Hub on Disk Brake bike - Is that right?
#1
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LBS says no Dyno Hub on Disk Brake bike - Is that right?
I'm starting to zero in on a new commuter I think might work for me. It's the KHS Green 8 step-through frame. Here's a link to the specs: https://khsbicycles.com/bikes/2014-kh...ls/green-8-14/.
I'm trying to get away from rim brakes, and the guy at the LBS says that this bike can be equipped with a disk brake on front. Problem is, I also want dyno hub lighting. The guy at the shop says that there's no way to use a generator hub on a wheel with a disk brake. That doesn't sound right to me, but I don't know a lot about brakes or dyno hubs. So, all-knowing forum members, help me out here. Is that right, or is this guy confused?
I'm trying to get away from rim brakes, and the guy at the LBS says that this bike can be equipped with a disk brake on front. Problem is, I also want dyno hub lighting. The guy at the shop says that there's no way to use a generator hub on a wheel with a disk brake. That doesn't sound right to me, but I don't know a lot about brakes or dyno hubs. So, all-knowing forum members, help me out here. Is that right, or is this guy confused?
#2
aka Phil Jungels
There was one posted on here within the last week. I think it was from a German wheelbuilder, a big one.
#4
aka Phil Jungels
https://www.bikeforums.net/showthread...s-or-lbs-build
follow the link on the first post in the string
follow the link on the first post in the string
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https://www.bikeforums.net/showthread...s-or-lbs-build
follow the link on the first post in the string
follow the link on the first post in the string
My problem now is that Memphis doesn't have a culture of transportation cycling, so I'm having trouble finding an LBS that can answer basic questions like this. Even if I figure out on my own which wheel/hub to order, I'm going to have a heck of a time finding a shop I trust to install it.
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ya, you're limited to Shimano, SON and Shutter Precision. And maybe a few more
#7
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I use the Shimano Alfine DH-S501 dynamo hub on my disc brake bike. I liked it so much, I bought one to use on my rim brake bike. See the installation sheet at techdocs.shimano.com It's available in either black or silver. There are probably others out there, but this is the one I own and have experience with.
Your LBS can also order a prebuilt wheel with that hub from QBP's Handspun Wheels division--either the stock WE7246 or one built to your specification. My LBS ordered to my spec when I got the one for the rim brake bike. Velocity A23 hoop (black), DH-S501 hub (black), DT Revolution spokes laced 3-cross, with brass nipples. Came in two days later.
The picture of the WE7246 shows the rubber cover in place over the rotor mount. It just pops off and you put on your rotor.
EDIT: The installation sheet I linked to above, also shows how to do the wiring. With luck, your bike will have a hole on the front of the fork crown for mounting a caliper brake or fender. Your light will mount there. (There are also handlebar mounts available.) Shimano shows wrapping the wire around the fork. I used Jagwire's stick-on cable guides (or was it the stick-on hydraulic brake hose guides?) on the inside of the fork leg instead. A little neater installation. On one bike I use those to run the taillight wire. On the other I just used zip ties
Your LBS can also order a prebuilt wheel with that hub from QBP's Handspun Wheels division--either the stock WE7246 or one built to your specification. My LBS ordered to my spec when I got the one for the rim brake bike. Velocity A23 hoop (black), DH-S501 hub (black), DT Revolution spokes laced 3-cross, with brass nipples. Came in two days later.
The picture of the WE7246 shows the rubber cover in place over the rotor mount. It just pops off and you put on your rotor.
EDIT: The installation sheet I linked to above, also shows how to do the wiring. With luck, your bike will have a hole on the front of the fork crown for mounting a caliper brake or fender. Your light will mount there. (There are also handlebar mounts available.) Shimano shows wrapping the wire around the fork. I used Jagwire's stick-on cable guides (or was it the stick-on hydraulic brake hose guides?) on the inside of the fork leg instead. A little neater installation. On one bike I use those to run the taillight wire. On the other I just used zip ties
Last edited by tsl; 01-04-14 at 05:17 PM.
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I guess, technically, the LBS guy is right b/c, technically, these hubs create alternating current so they're generators. Dynamos produce direct current. So, yeah, he ain't lying... he's just wrong.
#9
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Whatever the case, I think it may be harder to get a generator/dynamo hub WITHOUT a disc mount than the other way around.
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Generators produce AC; dynamos produce DC. The dictionary would be a lot thicker if they got into every minute technical distinction. To the lay-person, either one is a thing that produces energy. To those of us who frequent online forums to get pedantic about bike components, it makes a difference... Although every bike geegaw I've ever seen that isn't running on batteries takes AC...
Don't get me started on the "cog" thing....
Don't get me started on the "cog" thing....
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I use the Shimano Alfine DH-S501 dynamo hub on my disc brake bike. I liked it so much, I bought one to use on my rim brake bike. See the installation sheet at techdocs.shimano.com It's available in either black or silver. There are probably others out there, but this is the one I own and have experience with.
1. SP PD-8 with Mavic Open Pro, sapim spokes.
2. Shimano Deore XT dynamo with Mavic A319, pillar spokes.
3. Shimano Deore LX dynamo with Alex ACE18, DT swiss champion spokes.
All silver in colour except the shimano hubs are black. All of these are disc hubs.
Also have a Shimano capreo dynamo hub for a folding bike (it was hard finding somebody who could cut really really short spokes).
They all run great.
EDIT: The installation sheet I linked to above, also shows how to do the wiring. With luck, your bike will have a hole on the front of the fork crown for mounting a caliper brake or fender. Your light will mount there. (There are also handlebar mounts available.) Shimano shows wrapping the wire around the fork. I used Jagwire's stick-on cable guides (or was it the stick-on hydraulic brake hose guides?) on the inside of the fork leg instead. A little neater installation. On one bike I use those to run the taillight wire. On the other I just used zip ties
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I use the Shimano Alfine DH-S501 dynamo hub on my disc brake bike. I liked it so much, I bought one to use on my rim brake bike. See the installation sheet at techdocs.shimano.com It's available in either black or silver. There are probably others out there, but this is the one I own and have experience with.
Your LBS can also order a prebuilt wheel with that hub from QBP's Handspun Wheels division--either the stock WE7246 or one built to your specification. My LBS ordered to my spec when I got the one for the rim brake bike. Velocity A23 hoop (black), DH-S501 hub (black), DT Revolution spokes laced 3-cross, with brass nipples. Came in two days later.
The picture of the WE7246 shows the rubber cover in place over the rotor mount. It just pops off and you put on your rotor.
EDIT: The installation sheet I linked to above, also shows how to do the wiring. With luck, your bike will have a hole on the front of the fork crown for mounting a caliper brake or fender. Your light will mount there. (There are also handlebar mounts available.) Shimano shows wrapping the wire around the fork. I used Jagwire's stick-on cable guides (or was it the stick-on hydraulic brake hose guides?) on the inside of the fork leg instead. A little neater installation. On one bike I use those to run the taillight wire. On the other I just used zip ties
Your LBS can also order a prebuilt wheel with that hub from QBP's Handspun Wheels division--either the stock WE7246 or one built to your specification. My LBS ordered to my spec when I got the one for the rim brake bike. Velocity A23 hoop (black), DH-S501 hub (black), DT Revolution spokes laced 3-cross, with brass nipples. Came in two days later.
The picture of the WE7246 shows the rubber cover in place over the rotor mount. It just pops off and you put on your rotor.
EDIT: The installation sheet I linked to above, also shows how to do the wiring. With luck, your bike will have a hole on the front of the fork crown for mounting a caliper brake or fender. Your light will mount there. (There are also handlebar mounts available.) Shimano shows wrapping the wire around the fork. I used Jagwire's stick-on cable guides (or was it the stick-on hydraulic brake hose guides?) on the inside of the fork leg instead. A little neater installation. On one bike I use those to run the taillight wire. On the other I just used zip ties
#13
Senior Member
Generators produce AC; dynamos produce DC. The dictionary would be a lot thicker if they got into every minute technical distinction. To the lay-person, either one is a thing that produces energy. To those of us who frequent online forums to get pedantic about bike components, it makes a difference... Although every bike geegaw I've ever seen that isn't running on batteries takes AC...
Don't get me started on the "cog" thing....
Don't get me started on the "cog" thing....
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And maybe a few more
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A quick look on Wikipedia suggests that dynamos are a class of generator, and produce DC. No mention of generators being AC-specific at all. I've been pedantic about bike parts for years, and I've never heard anyone else make this distinction. Not that I'm trying to start an argument over this, I was just curious.
Still, none of the generator hubs mentioned on these threads are dynamos, though. And none of my bikes have any cogs on 'em.
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A quick look on Wikipedia suggests that dynamos are a class of generator, and produce DC. No mention of generators being AC-specific at all. I've been pedantic about bike parts for years, and I've never heard anyone else make this distinction. Not that I'm trying to start an argument over this, I was just curious.
it's really not important on a bike forum, is it? really.
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Generator=produces current
Dynamo=produces DC current
Alternator=produces AC current
Dynamo=produces DC current
Alternator=produces AC current
#19
Banned
full wheel
700c
front wheel dynamo (Alfine DH-S501)
disc brakes (also works with rim brakes)
€88 for the machine built and hand-trued front wheel
€20 for shipping and customs to the US from Germany
€108 total which is roughly $130 (not sure how much you're getting charged but this is a very nice off the shelf solution from a very reputable site)
https://www.bike24.de/1.php?content=8...;product=62193
700c
front wheel dynamo (Alfine DH-S501)
disc brakes (also works with rim brakes)
€88 for the machine built and hand-trued front wheel
€20 for shipping and customs to the US from Germany
€108 total which is roughly $130 (not sure how much you're getting charged but this is a very nice off the shelf solution from a very reputable site)
https://www.bike24.de/1.php?content=8...;product=62193
#20
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Magnets have a north pole and a south pole. On each rev of the wheel the coils move past the north or south pole and "alternately" produce positive and negative voltage on each side of the circuit. By definition, alternating current.
#21
Banned
I beg to differ. I have a Shimano dyno. It produces AC. My lights are designed to run off AC. But to charge my iPhone and other electronics I need DC and that requires a power converter to rectify the voltage.
Magnets have a north pole and a south pole. On each rev of the wheel the coils move past the north or south pole and "alternately" produce positive and negative voltage on each side of the circuit. By definition, alternating current.
Magnets have a north pole and a south pole. On each rev of the wheel the coils move past the north or south pole and "alternately" produce positive and negative voltage on each side of the circuit. By definition, alternating current.
TT sells a 5V USB transformer.
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But reading further that article also says "A small electrical generator built into the hub of a bicycle wheel to power lights is called a hub dynamo, although these are invariably AC devices,[SUP][1][/SUP] and are actually magnetos."
We're obviously talking about a "hub dynamo" on BF. I'm not aware of hub dynamos that output DC. Are you?
#23
Banned
A little research shows me that it is not entirely unambiguous because some of the terminology is confusingly similar. According to Wikapedia I was surprised to find that they say a "Dynamo" by definition produces DC https://en.wikipedia.org/wiki/Dynamo. "A dynamo is an electrical generator that produces direct current with the use of a commutator."
But reading further that article also says "A small electrical generator built into the hub of a bicycle wheel to power lights is called a hub dynamo, although these are invariably AC devices,[SUP][1][/SUP] and are actually magnetos."
We're obviously talking about a "hub dynamo" on BF. I'm not aware of hub dynamos that output DC. Are you?
But reading further that article also says "A small electrical generator built into the hub of a bicycle wheel to power lights is called a hub dynamo, although these are invariably AC devices,[SUP][1][/SUP] and are actually magnetos."
We're obviously talking about a "hub dynamo" on BF. I'm not aware of hub dynamos that output DC. Are you?
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Edit: I misunderstood. You're saying hub dynamo is AC, bottle is DC I guess...
Last edited by Walter S; 01-05-14 at 08:12 AM.
#25
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Maybe the confusion stems from the naming of generator hubs by Sturmy Archer. They called them "dynohubs" which is technically a misnomer, but the name stuck. It's kind of like calling a cola a coke or a cotton swab a Q-tip.