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Old 05-28-05, 07:06 AM   #1
Ziemas
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My wife would like some wider tires on her new bike. She currently has a nice set of Open Pro rims laced to 105 hubs. Do you think Conti Contact tires in size 700x37 (the actual mesurment is 700x34) would be safe? I'm worried about the tires being too fat for the rim and popping off while she is bombing down a cobblestone street. I mounted the tire on the rim at the store before I bought it and drippled it like a baketball for a while with no ill effect. What would you do if it were your wife? BTW I can't find any wider 700c rims or thinner tires, except 700x23 Grand Prixs. Thanks.

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Old 05-28-05, 08:37 AM   #2
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Quote:
Originally Posted by Ziemas
My wife would like some wider tires on her new bike. She currently has a nice set of Open Pro rims laced to 105 hubs. Do you think Coni Contact tires in size 700x37 (the actual mesurment is 700x34) would be safe? I'm worried about the tires being too fat for the rim and popping off while she is bombing down a cobblestone street. I mounted the tire on the rim at the store before I bought it and drippled it like a baketball for a while with no ill effect. What would you do if it were your wife? BTW I can't find any wider 700c rims or thinner tires, except 700x23 Grand Prixs. Thanks.
They should be safe as long as you don't exceed the recommended pressure (printed on the side of the tire), but those things weigh a ton! I put Specialized Turbos (700 x 26) on my wife's bike; folding bead (for lightness) and 130 psi; she LOVES them. Heavy tires w/ low pressures will make a bike feel sluggish.
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Old 05-28-05, 08:45 AM   #3
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Quote:
Originally Posted by Ziemas
My wife would like some wider tires on her new bike. She currently has a nice set of Open Pro rims laced to 105 hubs. Do you think Coni Contact tires in size 700x37 (the actual mesurment is 700x34) would be safe? I'm worried about the tires being too fat for the rim and popping off while she is bombing down a cobblestone street. I mounted the tire on the rim at the store before I bought it and drippled it like a baketball for a while with no ill effect. What would you do if it were your wife? BTW I can't find any wider 700c rims or thinner tires, except 700x23 Grand Prixs. Thanks.
I have been interested in (pretty much) this same question. I am building up some OPs (105 hubs, too!)and was wondering what the range of tire widths is. In all of my searching the widest I have seen anyone quote is 700x28. I will try to dig that up and link to it. My concern with widths that were "pushing" the range would be that they would roll off the rim when cornering. I would try to contact the tire manufacturer and see what they say.

Unfortunately, the Mavic site is kind of short on technical specs. They do have a tech support site, but it is only accessable by Mavic dealers. You need a username/password to get in. Maybe a Mavic dealer can help us out. I will try calling Mavic on Monday. I did talk to them about spoke tensioning and they did tell me that OPs should be tensioned in the 90-110kgF range.

Edit - Here's the Continental page for these tires:

http://www.conti-online.com/generato...ontact_en.html

I fired off a query to their tech support email. We'll see what happens next.

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Old 05-28-05, 08:50 AM   #4
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Quote:
Originally Posted by rmfnla
They should be safe as long as you don't exceed the recommended pressure (printed on the side of the tire), but those things weigh a ton! I put Specialized Turbos (700 x 26) on my wife's bike; folding bead (for lightness) and 130 psi; she LOVES them. Heavy tires w/ low pressures will make a bike feel sluggish.
She had thinner tires and didn't like them. We commute over really bad roads. Lots of potholes, coblestones, and tram tracks.

To give you an idea of the conditions of some of the roads we go over; I hit a pothole in my car the other day that was so big it tore apart two tires and flattened two rims. I was going about 40km/h.
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Old 05-28-05, 08:58 AM   #5
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Originally Posted by Ziemas
She had thinner tires and didn't like them. We commute over really bad roads. Lots of potholes, coblestones, and tram tracks.

To give you an idea of the conditions of some of the roads we go over; I hit a pothole in my car the other day that was so big it tore apart two tires and flattened two rims. I was going about 40km/h.
Wow, rough stuff! Sounds like you have thought the tire thing through. They should be safe, just don't overinflate OR underinflate; on such rough terrain low pressures could cause failures as well.
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Old 05-28-05, 08:31 PM   #6
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Peter White's site indicates that the open pro is for up to 25 width....I would e-mail him and ask him. He builds wheels (very nicely) and I trust his judgement. If it were my wife, no way. YMMV, ask the expert, not me.
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Old 05-29-05, 01:43 PM   #7
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Quote:
Originally Posted by Ziemas
My wife would like some wider tires on her new bike. She currently has a nice set of Open Pro rims laced to 105 hubs. Do you think Conti Contact tires in size 700x37 (the actual mesurment is 700x34) would be safe? I'm worried about the tires being too fat for the rim and popping off while she is bombing down a cobblestone street. I mounted the tire on the rim at the store before I bought it and drippled it like a baketball for a while with no ill effect. What would you do if it were your wife? BTW I can't find any wider 700c rims or thinner tires, except 700x23 Grand Prixs. Thanks.
I don't think an oversized tire will "pop off" the rim; just look at the profile of MTB tires. I would be more concerned about undersized tires, since the beads might not seat fully in the rim. Perhaps if you test-rode the bike yourself for an hour or so before letting your wife use it.
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Old 05-29-05, 04:58 PM   #8
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I've used 700x54 (WTB Nanoraptor 2.1") on Open Pros for riding on rough singletrack, never had any problems.
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Old 05-31-05, 11:50 AM   #9
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A tire that's too wide won't pop off. That's what happens with a tire that's too narrow. But there is a higher risk of tire sidewall failure and rim sidewall failure with a tire that's too wide. However, 700x34 isn't way out of line for a Open Pro. I'd be completely comfortable running that tire/rim combo.
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