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Old 08-14-17, 03:30 PM   #1
Muttley52
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tire vs. rim width

I want wider tires on the rear of my e-trike (3-4inch). How wide of 20" wheel do I need?
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Old 08-15-17, 12:09 AM   #2
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This link should set you up a treat:
Tire Sizing Systems

Remember to check for clearance before you start shopping.

On a trike, be prepared that a big change can cost serious money.
There may not be wide rim wheels available already built up with the kind of hubs your trike uses.
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Old 08-15-17, 04:14 AM   #3
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Remember to check for clearance before you start shopping.
You're talking about some pretty wide tires. Do 3-4" wide tires even come in 406 size?

There's quite a bit more to it than just tire and rim width. For tires much more than 2" wide you'll need a wider chain line. That means moving the crank out. You'll almost certainly also have frame clearance issues and you'll need a wider OLD rear axle.
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Old 08-15-17, 05:19 AM   #4
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There's quite a bit more to it than just tire and rim width. For tires much more than 2" wide you'll need a wider chain line. That means moving the crank out. You'll almost certainly also have frame clearance issues and you'll need a wider OLD rear axle.
OP is talking about wider rear tires to a trike. So chainline is unlikely to be an issue.
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Old 08-15-17, 05:58 AM   #5
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OP is talking about wider rear tires to a trike. So chainline is unlikely to be an issue.
The rear axle issue remains for tadpoles.
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Old 08-15-17, 05:59 AM   #6
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OP is talking about wider rear tires to a trike. So chainline is unlikely to be an issue.
I'll take that bet!

While having lunch at a bike shop/cafe yesterday, I looked over a couple of fat tire bikes to notice just how different they were. I'm thinking the chain is going to rub the side of such a wide tire unless you make a bunch of other changes.
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Old 08-15-17, 06:02 AM   #7
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The rear axle issue remains for tadpoles.
Indeed. But OP said rear WHEELS.
Making it unlikely to be relevant in this case.
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Old 08-15-17, 06:07 AM   #8
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I'll take that bet!
OP said rear WHEELS on a TRIKE.
So I'd assume a delta configuration.
And while these often only have one driven wheel, they usually use a chain running pretty much down the middle.
So again, I don't think chainline will be an issue.
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Old 08-15-17, 07:49 AM   #9
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OP said rear WHEELS on a TRIKE.
So I'd assume a delta configuration.
And while these often only have one driven wheel, they usually use a chain running pretty much down the middle.
So again, I don't think chainline will be an issue.


The OP was so lacking in information, I am not that confident the 's' was well placed or not.


Are fatbike tires even made in 20" (ISO 406?)?
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Old 08-15-17, 06:56 PM   #10
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Waiting to see if OP is another one-post wonder, asking a question that can't be answered and then disappearing.
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Old 08-15-17, 10:43 PM   #11
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The OP was so lacking in information, I am not that confident the 's' was well placed or not.


Are fatbike tires even made in 20" (ISO 406?)?
https://www.niagaracycle.com/categor...-4-black-black

I agree that we're lacking information. I've seen a few trikes with fat tires all around, and they all seem to have wider frames and rear hubs to accommodate the super-wide tire on a tadpole configuration. For a delta configuration, relacing the wheels with 4" wide rims might be possible with no other changes needed:

https://www.niagaracycle.com/categor...-1-4-36h-black
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