tire too wide to clear chain?! come on!!!!

[buttafinguz]

...aight, I was stringing the chain and I noticed that the chain would rub the tire about a quarte inch. I am assuming there is a fix for this because I've seen plenty of bikes with tires this size or about the same size or bigger with motors.
I have the Macargi "huntington" with the stock tires that come with it-"26x2.125".
"one step forward, too steps back".

 

[DaveC]

Which direction did you put the dish on the sprocket, faceing in or out? Maybe a photo if you can manage. If it's already faceing out then there is a problem...

 

[buttafinguz]

 

[mapbike]

Solutions,

Make spacer that will go between sprocket and rag joint so that sprocket will be spaced out farther so chain clears tire, or an easy solution would be to just buy the sprocket hub adapter from Pirate or one of the other vendors along with the desired sprocket and then you have adjustment.

Peace, Map

 

[mapbike]

I just installed 26x1.95 tires on my bikes, problem solved.

 

[buttafinguz]

Solutions,

Make spacer that will go between sprocket and rag joint so that sprocket will be spaced out farther so chain clears tire, or an easy solution would be to just buy the sprocket hub adapter from Pirate or one of the other vendors along with the desired sprocket and then you have adjustment.

Peace, Map

on this picture, is the spocket facing out. and how would i make a spacer for this? I have already sent pirate cycles email askong what size adapter I would need for a Macargi "Huntington. thanks for your advice.

 

[DaveC]

..hmm, you have the sprocket faceing the right way. The only thing I can think of is the wheel is built with a lot of bias to one side. How much clearance does the bike side chain have? if there's a good deal of room then a wheel builder might be able to move the rim over towards the pedal chain side a bit to clear the drive chain...or get the hub adapter, whichever works best for you

 

[buttafinguz]

yeah may just get an adapter. not sure what size though.

 

[buttafinguz]

anybody got picture of the adapter on the wheel?

 

[Bikeguy Joe]

It's more important that the chain runs in a straight line than if it rubs the tire a little. Sure, it will mess up your whitewalls if you have them, but a chain running out of alignment due to a spacer will ruin your day when the chain comes off and all the chaos that follows.

 

[rustycase]

Joe is correct.

...it's just one of the things we endure because of the mounting system the chinagirl uses.
There would be some fancy mounting technique involved to space the motor over, off-center, but it could be done.

I just encountered the opposite problem, and re-aligned the frame tail section to where it needed to be for the best chain run. Now I've got to dish the rim and pull the tire back over so the bike tracks properly. Easy enough to do...

You could dish your rim away from the chain, but not so much as it affected the handling. A quality 715H chain with good sprockets and quality tensioner might help???

Gosh those hub adapters are NICE!
A most important addition for any motorized bicycle.


Good luck
rc

 

[Bikeguy Joe]

I take the easy way out....1.90's.

 

[Mannhouse51]

I use 2.125's and there has been a very slight chain drag on the sidewall for a year now. But hey , the tread is almost gone now and it's about time to change the tire , so I like the idea of putting on a bit smaller tire . 1.90 sounds about right Bikeguy Joe. Thanks for the good advice!

 

[fugit]

hehe I had same problem on my 3G isla vista. The directions said use one rubber gasket on the inside of the spokes only. The sprocket fit great over the hub that way except the chain hit the tire and was a bit out of line. When I used the second rubber gasket outside the spokes it lined it up better and cleared the tire.

 

[bairdco]

i've solved this on some bikes by putting the sprocket on (dished out) then a set of the "moon" shaped plates, then the ragjoint, wheel, reagjoint, plates...

then put more washers on the engine side axle and less on the pedal side. wheel might not be centered in the frame, but you won't notice unless it rubs (or it's waay crooked.)

best fix is the adapters that are available. the ragjoints blow...

and, if it only rubs alittle, don't worry about it. if it starts eating your tire, then it needs to be fixed immediately. i've fixed other people's bikes after they shredded a tire in less than a day.

 

[buttafinguz]

hehe I had same problem on my 3G isla vista. The directions said use one rubber gasket on the inside of the spokes only. The sprocket fit great over the hub that way except it hit the tire and was a bit out of line. When I used the second rubber gasket outside the spokes it lined it up better and cleared the tire.

where did you put the other gasket? i didnt even use it.

 

[fugit]

where did you put the other gasket? i didnt even use it.

One right behind the sprocket between it and the spokes. The other of course inside the spokes using the metal brackets to secure it. I went downstairs to check on alignment for the 40ths time and it looks spot on. I did make an adjustment to the chain tensioner as result of reading this thread though

I had a dust cover i kept in place but I should of filed it down a bit cause i think I scruntched it in a bit. I will revisit that later though. I guess i could of just tossed the dust cover though as the area should be fine with out it. And I could inject white grease with out taking apart the system more frequently.

So it goes Sprocket, rubber gasket, spokes, rubber gasket, metal brackets..add bolts!
anyway good luck

 

[buttafinguz]

Im gonna give that a try. Thanks everyone for they advice.

 

[DaveC]

heheh, we'd have caught that with a photo of both sides of the sprocket. My mistake for not asking.

 

[fugit]

Well i guess i aient no newb anymore no mo...dang vern