A Motorized bike for ultra long distance

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I'm considering riding my bike from Saint Louis, Missouri to Oceanside, California and and am thinking about using a motorized bike to make it easier I'll probably be using the motor for 3 to 5 hours at a time to make the journey go by a little faster so i need a set up thats capable.
 
Traveling alone or with a group? Towing trailers or everything on the bike? Why so long between stops, is there nothing to see and photograph on your route? How far can you currently cycle with the cargo you need to carry? You already have a nice touring bicycle? What kind/size is it? Any special items of cargo that need to be able to fit on the bike? Can engine spares be sent ahead "poste restante"? When is this trip to take place? What are the laws in the states you will be riding through?
 
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I'll be travelling along probably with a trailer and stuff on the bike. Theres not much to see until i hit Denver. I'm still improving my cycling ability. Right now i have a cheap giant bike. I probably will be buying somethiing like this https://www.rei.com/product/108588/cannondale-caadx-105-bike-2017 . this trip will take place in the spring
The link doesn't work for me but I found the 2016 cannondale caadx 105. It seems a light bike for serious self supported touring. Towing a trailer certainly seems a good idea for this bike. It's mainly the wheels & tyres that I would be concerned about. Any cargo or motor adds considerable _unsuspended_ weight. Although I do some cycle touring on 32mm tyres on 15/19rims.
Electric could be cool with this bike (and mine). The alloy frame suits the smoothness. All the extra battery packs and an electric hook up can be carried in the trailer. You'll have to camp at campsites that offer electricity and charge all your battery packs overnight.
That BB30 would be a problem if you want to fit a Sick Bike Parts freewheel crank so you can have a geared human-electric hybrid. The SBP freewheel crankset fits on common threaded cartridge type bottom brackets with the old square taper or ISIS spindle, not BB30 as far as I know.

I haven't seen an example of a throttle on drop handlebars. Perhaps a thumb throttle could work, but it sounds uncomfortable to me. I always cycle tour with flat bars (some with bar ends,/aerobars) anyway so it's not a problem I've looked into.

I like 4130 cromoly frames for self supported touring bicycles. Alloy is for credit card touring, IMO, and for people who had to get a cheap alloy bike while they're building up their motored bike, haha. :) Steel feels so much nicer.
Steel seems ideal for the two stroke engine, too, which you probably still have time to get to know by researching here. It might not be legal every place you are traveling through.
Steel is nice for comfort on a long distance touring bicycle and I think it would be great with electric motor, a nice smooth silent ride. :)
I like 26 inch wheels. I'm using 26" on the bike I am building up to motorise. Once distance goes over a certain point, the weight of cargo and the certainty of having to ride some bad surfaces means that a wider tyre does make up for its weight in reliability and comfort, IMO, even without the motor. With 26" size I could totally overspec my wheels for durability and not pay much money for them (26" is old hat now). No need to worry about the weight of really heavy duty wheels on my build as I am building a two stroke geared bike for the difficult hills and coastal headwinds.
But if you want to keep it light and simple, that could be great too. I wouldn't be brave enough to try it but who knows, it might be totally fine even to put a two stroke engine on a light alloy CX bike with a carbon fork.. :)
 
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that is so cool! yea I'd imagine you definitely need a trailer or else really badass luggage racks

I'm likely biased according to the set-up I ride at home (keeping to a 20 mile range), but my first thoughts are: have a lot of towing/hailing capacity & bring tools, like a full shop condensed down to 15 to 20 pounds, a full 2nd engine's worth of spare parts (another 25-30lbs). Have it on a really reliable bike good bearings really balance and true Wheels everything set up really robust . And the key is gearing. I'd stay single speed for Simplicity and reliability. For most of your writing I used one of the sprockets the people use for setting maximum top speeds like over 50 except just ride it out at a cruise of 25 and you keep the engine right right at it's max lifespan sweet spot I'm thinking, & build a low rev expansion chamber. But I'm imagining all this for doing it with a China Girl 2 stroke motor, and come to think of it you may well pick a four stroke and have this stuff not be such an issue
 
Four stroke engine requires use of a very wide crank (q factor) probably wider than you can find in a BB30 as they're made for the four stroke kits.

Single speed left side (2 or 4 stroke engine) drive on a 32 spoke, 11 speed wheel with disc brake requires a "top hat adapter" for the disc rotor mount, plus spacers for the disc rotor and caliper. Some fabrication might be necessary for the caliper spacer.
 
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Getting any bike, rider, and trailer up long steep hills is going to require a seriously low gear. Too low to be any good for flat roads. You are going to need a shifter bike. You are also going to need a quality 4 stroke engine. Those Chinese crap engines wouldn't come close to lasting that kind of distance. And that Cannondale is not suitable for such a setup. I recommend building the bike, starting with a cromoly steel mountain bike frame for strength, a super strong rear wheel 26x2.125, and a disc front brake if possible. Doesn't matter about the rear, the front does 90+% of the braking. The reason for the strong front brake is going downhill. Check the laws of the states you are going through. Unlike concealed carry permits, there is very little reciprocity between states with regard to motorized bikes. In some states they are not legal at all. Many states allow bicycles to be ridden on the shoulders of freeways, but that does not include motorized bikes. So trying to follow bicycle routes will not usually work on a MB.
 
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Get a setup like mine and just use one engine for most of the trip. If you ever need extra power or something happens to you first engine you can run the 2nd engine as backup. And they're 4 strokes so they are reliable.
 
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