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Discussion Starter · #1 ·
Thinking of making my own fatbike and I have a couple of questions.

1. How fat is a Surly tyre when it's on the rim and inflated? I'm trying to establish how much clearance I'll need to allow.

2. Rims - how much difference does an ultrawide rim make to the tyre performance? I'll aim to start with Surly rims. This is not such a critical question because I can rebuild the wheels if I want to go wider/narrower.

Thanks.
 

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It aint gonna ride itself
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This is my contribution:



A Larry on a 48mm trials rim comes out to 83mm over the outermost knobs, which are 340mm from the axle center. It almost fits a Surly 1x1 fork, and would fit if I were patient enough to shave a mm or two off of all the side knobs...
 

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A Surly Maverick
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I`ve run Endos on Large Marges (still do at the back)and get 94mm max width.

Recently I`ve been using a TrialsTech front trials rim (47mm) and getting 88mm max width with Larry.

Width of rim changes the tyre profile, the Larry has a more rounded on compared to the Endo on 65mm LMs.

Cheers,
Dr FG.
 

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Discussion Starter · #5 ·
Thanks all. That's the sort of info I was after before I start chopping up frame tubes.

Dr Feelygood, what is the advantage of a 47mm rim on the front - or is just to fit within a fork?
 

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Velobike said:
Thanks all. That's the sort of info I was after before I start chopping up frame tubes.

Dr Feelygood, what is the advantage of a 47mm rim on the front - or is just to fit within a fork?
The more rounded profile would be preferable if you plan to ride the bike more in dirt...the wider rim provides more float for snow/sand.
 

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A Surly Maverick
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Velobike said:
Thanks all. That's the sort of info I was after before I start chopping up frame tubes.

Dr Feelygood, what is the advantage of a 47mm rim on the front - or is just to fit within a fork?
Purely pragmatic regarding the rim width.

The DUC has an inverted `baseball bat` leg design, so the tyre clearance gets less the further into the travel you go.
Larry on this rim gives enough clearance, without much loss of footprint (88mm as opposed to 94mm) ie 6mm.
I made the decision based on my own sand riding experience. Most of your weight is over the rear tyre so that`s where you need max footprint.

Also Larry is MUCH better at the front than an Endo from a steering viewpoint.

I`ve no regrets giving it a try :thumbsup:
 

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Discussion Starter · #8 ·
Step 1. Tyre has arrived.

Tried it in all my spare forks, just in case it would squeeze in :)

Now to get a fork built so I can try this on a 29er frame before venturing into frame building/mutilation.

[URL=https://www.flickr.com/photos/[email protected]/4894821382/]
No room in On-One by epicyclo, on Flickr
 

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A Surly Maverick
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Velobike said:
Step 1. Tyre has arrived.

Tried it in all my spare forks, just in case it would squeeze in :)

Now to get a fork built so I can try this on a 29er frame before venturing into frame building/mutilation.
I`m looking forward to your project :D

Take lots of Pix please. :thumbsup:
 

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Velobike said:
Step 1. Tyre has arrived.

Tried it in all my spare forks, just in case it would squeeze in :)

Now to get a fork built so I can try this on a 29er frame before venturing into frame building/mutilation.

[URL=https://www.flickr.com/photos/[email protected]/4894821382/]
No room in On-One by epicyclo, on Flickr
forward that pic to on-one

perhaps you can get them exited about fat
 
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