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How wide a tire

Old 01-31-16, 03:40 PM
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How wide a tire

I got 19cm rims, plenty of clearance, 25mm tires on, how wide can I safely go?
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Old 01-31-16, 03:57 PM
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Originally Posted by Pistard
I got 19cm rims, plenty of clearance, 25mm tires on, how wide can I safely go?
I assume you mean your rim is 19mm, not cm, wide. I run 38mm wide tires on Sun CR-18 rims (18mm nominal width) without problems. Wide tires on narrow rims do put more stress on the rim sidewalls, so keep the tire pressure reasonable. Fortunately, wide tires need proportionally less pressure to get the same rolling resistance as an otherwise identical narrow tire.
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Old 01-31-16, 04:13 PM
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Yea, verily on the CR-18s. I have a set in 590, and have been running Schwalbe Marathon Plus in 42-590. 19 mm rims should handle any width suitable for a road bike or hybrid.
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Old 01-31-16, 04:47 PM
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Originally Posted by JohnDThompson
I assume you mean your rim is 19mm, not cm, wide. I run 38mm wide tires on Sun CR-18 rims (18mm nominal width) without problems. Wide tires on narrow rims do put more stress on the rim sidewalls, so keep the tire pressure reasonable. Fortunately, wide tires need proportionally less pressure to get the same rolling resistance as an otherwise identical narrow tire.
It would depend if the OP is measuring inside width or outside width.

Many MTB rims are fairly narrow, but still have about 19mm inside width.

Classic road rims are much narrower, and have about 19mm outside width, and maybe 13mm inside width.

For the 23mm (outside) and wider rims, one can go with pretty big tires.
For the 19mm (outside) and similar rims, maybe 28mm or 32mm???

If you look, there are a few charts with recommended rim/tire widths.



I haven't used this chart myself, but it looks reasonable. I think the rim widths are inside widths.

I think I have heard of some complaints of sideways flex with using too narrow of a rim with too wide of a tire.
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Old 01-31-16, 06:28 PM
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I run 42s and 47s on 19mm rims, no issue.
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Old 01-31-16, 06:35 PM
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what is the width of the frame at the closest point it is to the Tire? that may be your clearance issue .
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Old 01-31-16, 06:52 PM
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Originally Posted by fietsbob
what is the width of the frame at the closest point it is to the Tire? that may be your clearance issue .
Great point, Bob. Also, the length of chain stays and fork, as wider tires are bigger in depth, too. The OPs claim of plenty of clearance on a road bike with 25s might be optimistic. The chart with recommended tire and rim combinations looks conservative, but very safe. It does seem that frame limitations, rather than best rim practice, may be the more practical issue.
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