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17mm internal width rim, 1.75" tire

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17mm internal width rim, 1.75" tire

Old 04-29-20, 02:56 PM
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JWK
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17mm internal width rim, 1.75" tire

So my wife has a Surly disc trucker and wants to upgrade her wheels/tires. We thought about going to 650b, but it's not so simple going from smaller to bigger. Long story short, we're seeing if we can make the 26" wheels work. The biggest problem being the horrible selection of tires now in 26"

The inexpensive short term solution is to get Panaracer Paselas in 1.5" or 1.75" and use her wheels that came with the bike. The rims are 17mm internal width. The tires that came on the bike are some cheap 1.5" wire bead. The wife wants to try 1.75" because of our horrible roads here in central Maine, and all the gravel roads we also to get to ride on to get out of the traffic. I'm afraid the tires will handle horribly at a comfortable psi, which will probably be a bit lower than what would be used on normal pavement.

I'm going to look further into the 650b conversion, and if that doesn't seem like a good option, I'll build her a new wheelset with wider rims. Until then, does anyone have any idea how a 1.75" (44mm - 45mm) tire will work on a 17mm internal width rim at lower than typical psi?
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Old 04-29-20, 03:54 PM
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Originally Posted by JWK View Post
I'm afraid the tires will handle horribly at a comfortable psi, which will probably be a bit lower than what would be used on normal pavement.
Her lower weight means less squirm at a given pressure. Bigger tires also usually mean a firmer feel at a given pressure. What sounds like it'll be mushy for you might be fine for her. Unless she's railing paved corners like a crit racer, I'd try it before worrying about it. 1.75" tires on 17mm-internal rims was a totally normal thing to do for a long time, and while it's not exactly ideal, it's not necessarily a big issue either.

I've got 2.1" Rene Herse Rat Trap Pass ELs on my gravel bike on rims that are ~21mm internal, and with a bike+rider weight of ~200lbs, I usually run them at around 30r/25f for mixed-surface riding. The steering starts to get a little funky on pavement at those pressures, but nothing catastrophic, and nothing that I can't acclimate to. A few of my paved KOMs were even achieved on that bike in that configuration.

Last edited by HTupolev; 04-29-20 at 03:59 PM.
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Old 04-29-20, 04:34 PM
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Originally Posted by HTupolev View Post
... 1.75" tires on 17mm-internal rims was a totally normal thing to do for a long time, and while it's not exactly ideal, it's not necessarily a big issue either.
Id go further and say that much wider tires were...and are... a normal thing. All four of my mountain bikes run at least 2.125 tires on 17mm rims in a 559mm size. Its not an issue and Ive never experienced any problem with the tires in terms of handling.
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Old 04-29-20, 05:06 PM
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Originally Posted by JWK View Post
So my wife has a Surly disc trucker and wants to upgrade her wheels/tires. We thought about going to 650b, but it's not so simple going from smaller to bigger. Long story short, we're seeing if we can make the 26" wheels work. The biggest problem being the horrible selection of tires now in 26"

The inexpensive short term solution is to get Panaracer Paselas in 1.5" or 1.75" and use her wheels that came with the bike. The rims are 17mm internal width. The tires that came on the bike are some cheap 1.5" wire bead. The wife wants to try 1.75" because of our horrible roads here in central Maine, and all the gravel roads we also to get to ride on to get out of the traffic. I'm afraid the tires will handle horribly at a comfortable psi, which will probably be a bit lower than what would be used on normal pavement.

I'm going to look further into the 650b conversion, and if that doesn't seem like a good option, I'll build her a new wheelset with wider rims. Until then, does anyone have any idea how a 1.75" (44mm - 45mm) tire will work on a 17mm internal width rim at lower than typical psi?
I suspect that you are overthinking this. Paselas are not overly expensive tires, and it would be easy to do this experiment. I have ridden similarly sized tires on similar width rims without problems. I have a set of 700 x 32 Paselas on my touring bike and not only do they have a nice ride, they are also surprisingly fast, I have little trouble keeping up with friends on road bikes on group rides and I have to brake on descents so as not to run into the person in front of me. Before you discount a solution, you should try it to see if it works. A set of 1.75" Paselas is not a big investment, why not give them a try?

Last edited by alcjphil; 04-29-20 at 05:10 PM.
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