help sizing for sprocket adapter

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chris8686

New Member
May 2, 2013
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Bellingham
Long time without posting! I have had non motorbike friendly weather here in Washington for the past few months.

I am going to be building my first 4 stroke kit this winter. I bought an EZ motorbike kit. For this build I am going to be converting on of my 2 stroke shift kit bikes to a 4 stroke.

On to business. I want to put a sprocket adapter on this build. I am little confused on the proper sizing of adapter that I need. My 2 bikes both have freewheel hubs. The diameter of the hubs of these bikes are .683" and 1.100". I cant find an adapter that will work with either of these hubs. The adapter listed on bikeberry.com listed to have and adapter for hubs measuring 1.003-1.008". I am nowhere near close to that in either direction. the next size up is 1.250"

Any help with this would be much appreciated. I have only built bikes with shift kits on them and this is a very new thing to me.
 
JoeMetro

JoeMetro

Member
May 4, 2014
67
3
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California
Hey there, for your situation I think the best option would be a Manic Mechanic sprocket adapter (which I think are the same ones that Bike Berry sells they just put it under their own brand name).

Now the adapters themselves only fit 1.520"-1.528" hubs, BUT they sell custom shims. These shims come in a ton of sizes, including 1.109" and 0.687". Those are pretty clsoe to your dimensions, I'm not sure if they would work though. I think you may be able to email them and ask for a custom shim.

Sprocket adapter: http://www.mmbikeparts.com/Adapters-Sprockets-s/135.htm

Shim: http://www.mmbikeparts.com/Manic-Mechanic-Freewheel-Conversion-Reducer-p/free-wheel-reducer-1.htm
 
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RichP

New Member
Jul 30, 2016
16
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0
Plymouth
Hello, i'm trying to order a sprocket adapter assembly and the minimum diameter size available is 1 inch. The problem is every wheel I can find has an axle diameter of about 10mm. Can somebody tell me what i'm doing wrong please?
 
allen standley

allen standley

Well-Known Member
Oct 22, 2011
1,126
238
63
Bangor, Maine
Chris & Tom - sorry for Hijacking the thread. Fix if it should be please.

To Rich,
Rear
http://www.huskybicycles.com/mm5/merchant.mvc?Store_Code=hb&Screen=PROD&Product_Code=500-224

Front
http://www.huskybicycles.com/mm5/merchant.mvc?Store_Code=hb&Screen=PROD&Product_Code=507-309

Above are laced with 12g spokes and I find them lighter with sufficient strength compared to 11g. which are slightly heavier. The Shimano Coaster brake is premium compared to the KTM brand, but more reliable. 10 bucks or so more.
There are many other options. Husky builds the best for the money in my opinion. If you go this route using a coaster brake rear and a drum front you will not be sorry. The Standard adapter on the shimano coaster brake cannot be beat for simplicity and reliability.
Before ordering the adapter found here
http://www.gasbike.net/collections/...oducts/44-tooth-cnc-sprocket-adapter-assembly
Be sure it is the correct size and call the vendor to confirm it will fit your chosen wheel/hub. Others will chime in with their suggestions. For me and my riding Coaster brake rear and front drum can't be beat. For tips concerning chain fitting can be found here-
http://motorbicycling.com/album.php?albumid=1499
Good Luck and be safe!
 
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RichP

New Member
Jul 30, 2016
16
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0
Plymouth
So, 12g is slightly heavier than 11g. Thanks, I live in England, to buy and ship those wheels with tubes and tyres would cost more than the entire engine kit & bike frame!
 
allen standley

allen standley

Well-Known Member
Oct 22, 2011
1,126
238
63
Bangor, Maine
Sorry could not help further. If your Location said Plymouth U.K. I would have known. also "12g spokes are lighter with sufficient strength compared to 11g" (which are larger in diam heavier). . No - 11gauge is heavier than 12 here in U.S.
 
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RichP

New Member
Jul 30, 2016
16
0
0
Plymouth
So you know i'm in the u.k, you've advised I purchase some wheels for the same price as a second - hand car. I'm more confused than i was in the first place.
 
Chaz

Chaz

Well-Known Member
Jun 3, 2012
1,004
72
48
Vancouver, British Columbia
There's nothing wrong with the stock rag joint if set up properly. Got a couple of thousand miles on mine with the odd removal and replacement to fix spokes etc.

The intrepid Ludwig may be able to help with sourcing wheels in the UK.

So you live in a Plymouth? I lived in a Chevrolet once.
 
allen standley

allen standley

Well-Known Member
Oct 22, 2011
1,126
238
63
Bangor, Maine
Got a couple of thousand miles on mine with the odd removal and replacement to fix spokes etc.
That's about right. Typical bicycle wheels are laced with 14g spokes. Rag Joint will work fine up to a couple thou miles (as you say and I agree). Then spokes begin to fail. Pop one, replace it then another goes pop shortly after. Then another, then another. Twisting back and forth back and forth. You are only using 18 spokes out of 36 - a cycle of continual replacement. 14g is too light with a rag joint if you are serious about trouble free drive line reliability. You will be troubled with a wheel of any hub laced with 14g spokes. You must use a sprocket adapter fastened at the hub using the strength of all 36 spokes with 14g spokes, then you can expect a little more life from the wheel. Most multi speed and inexpensive coaster brake rears are laced with 14g. NOT intended to be motor driven. With that in mind and reliability of primary concern - avoid any rear wheel, of any type with 14g spokes if you are expecting a rag joint set up to be trouble free beyond a season. Simply cannot tolerate the constant acceleration and deceleration over time. I KNOW using a hub adapter on a Shimano Coaster Brake with 12g spokes will out last a multi speed hub RAG Joint mounted sprocket on 18 14g spokes by YEARS.
I must also confess - my bike is primary transportation for me. 150 mi per week min to work and home every weekday. If you ride just for pleasure 10 or 20 mi a week, your riding season will be far less demanding. Reliability not so much an issue. Go ahead and use the rag joint. My 2 cents and my 5 years building/riding experience tells me this.
 
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RichP

New Member
Jul 30, 2016
16
0
0
Plymouth
So, as previously stated i'm trying to order a sprocket adapter assembly, I live in the U.K, surely there must be a wheel ideal for the adapter and disc brake. Please help with my question. Thanks.
 
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sboricic123

Member
Apr 15, 2013
172
3
18
Bailieboro, Ontario
My opinion on my purchase of a sprocket hub adapter....It's the best money I've spent on something for my motor bicycle. I got tired of replacing spokes or buying new rims. It cost me $92 Cdn but well worth it. I used a digital caliper to measure my hub as recommended by a few folks here on the forum.
 
Tyler6357

Tyler6357

Well-Known Member
Mar 15, 2012
1,293
294
83
Santa Barbara, CA
If you are looking for a sprocket adapter that will fit a mountain bike hub that has a smaller diameter hub than that of a cruiser with a coaster break, livefastmotors sells one that will fit a 1.2" diameter (3.75" circumference) hubs often found on mountain bike rear hubs. Also, the small ones come with shims so you can use them on even smaller diameter hubs. They also make one for a cruiser coaster break hub as well. They are 9 hole sprocket adapters and you can get cheap sprockets in different #s of teeth that will fit them on e-bay from boy-go-fast and others. They are only good on hubs with 36 spokes. They are $65.

Fits Mountain hubs---> http://www.livefastmotors.com/produc...ter-small.html

Fits Cruiser hubs---> http://www.livefastmotors.com/produc...ter-large.html

40T Sprocket--> http://www.ebay.com/itm/80cc-Motor-b...3D191452735464
 
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RichP

New Member
Jul 30, 2016
16
0
0
Plymouth
I am looking for a wheel that suits the adapter assembly, not an adapter that will suit y wheel. I have no wheel, this is the point of my question. Also, the first 2 links lead to nothing & the third is a link to some random parts sold on e-bay.???? I'm looking for a wheel, surely somebody can help me please.
 
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