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tire fit issues

Old 07-26-20, 10:19 PM
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Retfor
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tire fit issues

so, im having some issues with my tires. i have a 2004 cannondale jekyll 600 which i converted to electric. (rear hub motor). when riding, it feels unsteady sometimes, especially when cornering. now, some of that may be that im not used to full suspension, this is my first fs bike, but ive noticed also that the rear tire has some sideways movement over the wheel. im pretty sure that thats also a source of the squishy/unsteady feeling i get sometimes. how can i fix this? the rim is a 26" rim. the tire is a 26x2.0 schwalbe - https://www.amazon.com/gp/product/B004T0GCTU/. tube is 26x1.75 as i was sent the wrong thing, but searching online i found that itll stretch to fit no problem. after noticing the slight wobble to the tire, i asked the motor/wheel manufacturer what size tire the rim is ideal for and they mentioned 3 specific sizes - 1.75, 1.95, and 2.125. sheldon brown's site says that any decimal size from 1 to 5.0 should all be 559 bead and ive seen elsewhere in a thread on this site that 1.75 to 2.5 should all be interchangeable. theoretically, at least. is there some other difference, in maybe the bulbousness of the tire, that itll technically fit interchangeably but wont ride as well as the specific ones the manufacturer recommended?

while they should all theroetically fit, i did also have an issue with the front tire. it came with a knobby 2.1. i decided to change it for a smoother tire so i ordered another of the 2.0's that i got for the back for the front. before it came, i got a flat so i decided that while i had the tire off i would switch it out temporarily for a smoother 1.95 i had lying around. (doesnt have the puncture resistance of the schwalbe so i didnt want to use it permanently.) the 2.1 went on and off so easy i almost didnt need levers. (probably old and stretched out a bit.) but the 1.95 was so tight i punctured two tubes trying to get it on. i finally gave up and put the 2.1 back on until the schwalbe came. that was tight, but not as tight and i was able to get it on. i dont think im having any issues of wobble on the front, though. but i definitely am in the back. it sometimes gets that squishy feeling like when your tube is going flat, even though its not going flat.

any ideas?

thanks.
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Old 07-26-20, 10:41 PM
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You might mention what tire pressure you are using. It sounds like it might be too low.
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Old 07-26-20, 11:20 PM
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oh, right, i meant to mention that. i think its about 60 psi. i tried pumping it up more, but didnt really do much. i have a cheap schwinn pump, it might not be able to handle it, although the gauge goes higher....
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Old 07-27-20, 01:28 PM
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Guessing what pressure you have and actually knowing.........

You may also have a wheel problem where the spokes are getting loose.
Grab adjacent pairs and squeeze them together to see if you have slop.
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Old 07-27-20, 08:00 PM
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Originally Posted by Bill Kapaun View Post
Guessing what pressure you have and actually knowing.........

You may also have a wheel problem where the spokes are getting loose.
Grab adjacent pairs and squeeze them together to see if you have slop.
i know, but i only have the gauge on the pump to go by, though, and im not sure how accurate it is.

i did check the spokes and tightened a few, but still having the issue.
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Old 07-27-20, 08:47 PM
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So it's a guess about tire pressure and it's a guess about spoke tension and it's a guess about how many spokes and it's a guess about which hub.......
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