Oset 12
Mohammed Huberty
I've bought my son a second hand oset 16.0 36v for Christmas. Took him out today and the chain kept jumping off. I've stripped the bike this afternoon and I believe its happening because the chain needs replacing. The chain has KMC 8F 25HA stamped on it. I also would like to fit new sprockets as they look a bit worn. The front is a 12 tooth and rear 90. Are there any opinions on the heavy duty set that oset sells for 64? Also is the 68tooth rear sprocket in the heavy duty the same diameter as the 90 tooth one it has at moment so gearing will be similar to the original?
HA chain is heavy duty for that size (1/4" (.25) ) I tihnk the oset heavy duty chain is 219 kart chain ( but maybe 0.35), 219 , 35 and 8mm ( maybe someone reading this can check the actual size of the chain ) are all very similar in size but they are not interchangable between sprockets and chain. if the heavy duty oset rear is 68t then you would need a much smaller tooth count on the front to keep the same gearing i.e a 9t front , if they use bigger chain 219 ,8mm or 35 then a 9 up front is the very smallest that can be used with these chains but i personally would not use anything below a 11t , i would always go for 219 chain where possible as its about as strong and as good as you are going to get for the size ( also rear sprockets are very cheap and widely available but you need the sprocket adaptor for the rear wheel ).
yes if its a larger chain then the diameter of the rear sprocket would be about the same i.e the 90T ( 25 ) would be around the same dia as a 68T (219) but you would still have to change the front sprocket to match the chain type.
if its 219 then you can use 219 rear sprockets ( all sizes approx 6 from ebay ) but you would need a adaptor to mount the sprockets to the rear wheel, oset sell the adaptor but i have just looked on there web site and cant find it, in fact cant find any sprockets at all.
the new kit is all fitted, looks really good which is what matters , runs well though I have only tried it on the bike stand, it does make a louder running noise, I've sprayed chain lube on it which does quiet it down quite a bit. I made sure the sprockets were lined up. the kit is quite a lot wider than original and the rear sprocket is aluminium I believe. he's riding tomorrow so fingers crossed all will be well. the 68t sprocket is a similar size to the old 90t one.
Looking to buy a used oset 20.0 to putt around on. I'm not super familiar with maintenance and reliability of these things. Have models changed through the years? Is it best to get the newest model I can find? I see used ones from 2013 - 2017 and many with unknown years. Would love to pick up a used one and hopefully not run into too many problems.
They are pretty simple, the main thing is to know if the battery is still working right since they have limited charge cycles, and if it comes with a good charger.
The question is, how old are you? The Oset is great for teaching young kids to ride without having to deal with the clutch, shifting, engine, etc. But by the time they're big enough to ride a 20" they're usually ready to move to a 80jr. And start learning clutch control. Everyone's situation is different but that and a very difficult resale market are things to consider.
I had a Oset 20 for the kids and it worked great other than when I was on it it would die if overloaded going up a hill or when the battery was low. This would seem to happen at the worst possible time when not expecting it, not sure if this was an isolated problem or not. Had both 12 & 20 no problem selling them though.
I think it is a great training tool for gas trials but not for enduro unless you be careful not to overheat the motor. I added cooling fins and a thermometer and have a smaller rear sprocket on a second wheel and will see how that helps.
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