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Wheel/Tire Question

Old 12-30-14, 03:01 PM
  #1  
drywall
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Wheel/Tire Question

So I purchased a used Trek Soho S about a year ago. I've never done regular winter cycling before, but I'd like to go all-season as a bike commuter. My bike came with some 700x23c racing tires which held up pretty well for a while, but they are in dire need of replacement now. I want something a little grippier for the cold weather, and something that can handle wetter surfaces. I've been looking in the commuter tire lines which have more tread, but they also run wider.

My question is this: How wide can I reasonably expect to go on the rims of my Trek Soho S that were sporting 23c tires?
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Old 12-30-14, 03:12 PM
  #2  
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What is the inner width of your rim?

Check for adequate clearance between tire and chain stays, seat stays, brake bridge, calipers, fork blades, and fork crown.

[TABLE]
[TR="bgcolor: #cccccc"]
[TD][/TD]
[TD="colspan: 16"]
Tire section width
[/TD]
[/TR]
[TR="bgcolor: #cccccc"]
[TD]Rim width
(mm)

[/TD]
[TD="width: 34"]
18
[/TD]
[TD="width: 34"]
20
[/TD]
[TD="width: 34"]
23
[/TD]
[TD="width: 34"]
25
[/TD]
[TD="width: 34"]
28
[/TD]
[TD="width: 34"]
32
[/TD]
[TD="width: 34"]
35
[/TD]
[TD="width: 34"]
37
[/TD]
[TD="width: 34"]
40
[/TD]
[TD="width: 34"]
44
[/TD]
[TD="width: 34"]
47
[/TD]
[TD="width: 34"]
50
[/TD]
[TD="width: 34"]
54
[/TD]
[TD="width: 34"]
57
[/TD]
[TD="width: 34"]
60
[/TD]
[TD="width: 34"]
62
[/TD]
[/TR]
[TR="bgcolor: #cccccc"]
[TD]
13c
[/TD]
[TD="bgcolor: #ffffff"]
x
[/TD]
[TD="bgcolor: #ffffff"]
x
[/TD]
[TD="bgcolor: #ffffff"]
x
[/TD]
[TD="bgcolor: #ffffff"]
x
[/TD]
[TD="bgcolor: #ffffff"][/TD]
[TD="bgcolor: #ffffff"][/TD]
[TD="bgcolor: #ffffff"][/TD]
[TD="bgcolor: #ffffff"][/TD]
[TD="bgcolor: #ffffff"][/TD]
[TD="bgcolor: #ffffff"][/TD]
[TD="bgcolor: #ffffff"][/TD]
[TD="bgcolor: #ffffff"][/TD]
[TD="bgcolor: #ffffff"][/TD]
[TD="bgcolor: #ffffff"][/TD]
[TD="bgcolor: #ffffff"][/TD]
[TD="bgcolor: #ffffff"][/TD]
[/TR]
[TR]
[TD="bgcolor: #cccccc"]
15c
[/TD]
[TD][/TD]
[TD][/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD="bgcolor: #cccccc"]
17c
[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD="bgcolor: #cccccc"]
19c
[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[/TR]
[TR]
[TD="bgcolor: #cccccc"]
21c
[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[/TR]
[TR]
[TD="bgcolor: #cccccc"]
23c
[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[/TR]
[TR]
[TD="bgcolor: #cccccc"]
25c
[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[/TR]
[TR]
[TD="bgcolor: #cccccc"]
27c
[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[TD]
x
[/TD]
[/TR]
[TR]
[TD="bgcolor: #cccccc"]
29c
[/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[/TABLE]

Last edited by SquidPuppet; 12-30-14 at 03:16 PM.
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Old 12-30-14, 03:12 PM
  #3  
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The limiting factor for tire width is likely to be frame and brake caliper clearance, not rim width. Tread doesn't really do much if anything to improve tire grip on pavement. Look for tires with a rubber compound that is supposed to improve grip on wet roads
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Old 12-30-14, 03:20 PM
  #4  
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Originally Posted by drywall View Post

My question is this: How wide can I reasonably expect to go on the rims of my Trek Soho S that were sporting 23c tires?
I just posted this in another thread in this area:

My District S was the replacement for Soho S - pretty similar frames. It came with 28's but I put Vittoria Randonneur 37's on there.

The rims on my commuter are labeled 14mm, I measured 13.5mm on the inside. My tires are labeled 37mm but they measure 32mm when installed on these rims. That puts me a little outside the box and I wouldn't push it any farther than this, but I haven't had any problems.






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Old 12-30-14, 03:21 PM
  #5  
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The math is fairly simple but not Gospel.

Because the ID at the rim can't change, the outside radius of the wheel will increase by the change in tire width, ie. a 28mm tire will stand 5mm taller than a 23mm.
The side clearance between the stays will change by 1/2 the change in width since it goes in both directions.

So if you have 4mm to spare under the brake or fork, and 2mm on each side then you can go up 4mm in tire width. Note that both conditions have to b met.

As I said, the math is simple, but not Gospel because tires don't rin true to width, so a tire labeled as 5mm wider, may be more or less than wider in reality. Use the math as a guide, but don't work too close without testing a specific tire.
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Old 12-30-14, 04:11 PM
  #6  
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I use 35mm Michelin Pilot Sport on 15mm id rims and 700x35 Ritchey Speedmax on 13.4mm id rims. Works fine. I doubt you have clearance for bigger than that.
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Old 12-31-14, 03:51 PM
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A "cold weather tire" should have a different ( softer ), compound as well as tread designed for wet/snow/ice conditions, than a "normal" bike tire used in summer months. Road surface temperatures in the summer will make a harder compound tire get softer, as winter conditions make a softer "winter" tire get more firm. The information SquidPuppet posted is what's needed to make sure you get a tire that fits the rim and frame.
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Old 12-31-14, 04:33 PM
  #8  
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But you have 2 things going there .. Yes a Soft cold road compound May be good in cold weather . but not worth squat on Ice ..

Then A Hard compound will be better in keeping those Tungsten steel Studs in the tread .. Suomi-Nokias rubber compounds are Rather hard

But my 20 year old aged MTB tires still have all its 160 studs in each .. and have a Long life in this Occasionally icy place .

the A10 622-40 w/o studs was used on my 10 month Tour , hard to see any Wear .
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Old 01-01-15, 09:04 AM
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The original question was asking about tires for cool wet conditions, not ice
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