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Old 08-26-07, 05:51 PM   #1
xclam
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Road tires on MTB

I own a Gary Fischer hardtail MTB with 26-1.75 tires on them. My wife recently got a new roadbike and no longer rides her hybrid which have 700-28 tires on them. I am doing a metric century this coming weekend and was thinking of ways to increase my speed (with the use of my MTB).

Do you think I can switch the hybrid tires to my MTB? I believe the OD of the tire is about the same so the only real issue would be to re-adjust the brakes to grab a skinnier rim. Both my MTB and my wife's Hybird have the same 7-speed rear cassette so I think the gearing will be no issue.

Your collective thoughts???
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Old 08-26-07, 08:40 PM   #2
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I'd just get some 26" road slicks. If the wheels on your wife's bike are typical of hybrids, they're 700c. The brakes on your mtb won't line up with the 700c rims, your 26" mtb rims have a bead seat diameter of 559 mm, the bead seat diameter of 700c rims is 622mm. They make adapters, I think, to overcome this, or you might even be able, with some adaptation of your own, to attach caliper brakes at the fork crown and seatstay bridge. But there's really no reason to do all that, there are plenty of 26" slick tires out there that are good for pavement riding-
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Old 08-26-07, 08:57 PM   #3
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I own a Gary Fischer hardtail MTB with 26-1.75 tires on them. My wife recently got a new roadbike and no longer rides her hybrid which have 700-28 tires on them. I am doing a metric century this coming weekend and was thinking of ways to increase my speed (with the use of my MTB).

Do you think I can switch the hybrid tires to my MTB? I believe the OD of the tire is about the same so the only real issue would be to re-adjust the brakes to grab a skinnier rim. Both my MTB and my wife's Hybird have the same 7-speed rear cassette so I think the gearing will be no issue.

Your collective thoughts???
Won't fit.
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Old 08-26-07, 09:53 PM   #4
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The outer diameter of the tires may be nearly the same but the inner diameter of the tires (and the diameter of the rims) is a complete non-match.

700c rims are 622mm in diameter, 26" rims are 559mm in diameter.

Your brake pads would have to move 31mm (or about 1 1/2 inches) away from the hub in order to meet the rim. (31.5mm difference in radius for 63mm difference in diameter for the switch in rims).

700c rim/26" tire doesn't work at all, nor does 26" rim/700c tire.

You can buy a tire for your 26" wheels that is essentially a hybrid bike tire (or one that's a "road tire") though.
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Old 08-27-07, 12:30 AM   #5
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Ritchey makes a tire called "Ritchey Slicks." They're 26 x 1.4 and should work. Give them a try.
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Old 08-27-07, 06:08 AM   #6
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This all makes sense to me now. I already replaced my MTB knobby tires with some slicks that are the same size. I just wanted to see if I could get the skinny tires that can handle 110PSI versus what I'm stuck with which is 58PSI. Even at my max pressure, my weight (180lbs) compresses the tire a lot and creates a large contact patch with the road.
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Old 08-27-07, 06:42 AM   #7
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Ritchey makes a tire called "Ritchey Slicks." They're 26 x 1.4 and should work. Give them a try.
"Tom" Slicks.
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Old 08-27-07, 07:12 AM   #8
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Performance sells Forte slicks that are 1.25. I have used them on several bikes. Not all that special, but they are 4.99.

jim
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Old 08-27-07, 08:54 AM   #9
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I just mounted a set of Continental Ultra Gatorskin 26X11/8 on my Litespeed Pisgah and run them at 110psi. Road rocket!
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Old 08-27-07, 08:59 AM   #10
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I just mounted a set of Continental Ultra Gatorskin 26X11/8 on my Litespeed Pisgah and run them at 110psi. Road rocket!
But don't mix fractions with decimals when it comes to tire sizing. Are you saying it's a 26 x 1.125 tire (559mm bead seat diameter), or one of the fractional 26" tire sizes (w/significantly larger bead seat diameter)?.........I agree, Ultra Gatorskins are great tires-
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Old 08-27-07, 09:53 AM   #11
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Performance sells Forte slicks that are 1.25. I have used them on several bikes. Not all that special, but they are 4.99.

jim
They now have them "ON SALE" for $12.99
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Old 08-27-07, 10:19 AM   #12
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I used Primo Comets @ 100psi with very good results. Tough tire with low rolling resistance.
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Old 08-27-07, 10:36 AM   #13
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Ritchey Tom Slicks also come in a 1" width, which you can pump to 100 psi. ~$15 apiece on Nashbar or Performance.
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Old 09-01-07, 04:29 AM   #14
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A number of manufacturers make road slicks equal to or slightly wider than 700x20-23s. Tom Slicks, Continental(pricier), Panaracer and Performance Fortes. I have order these fairly recently(and if the postal svc. would just DO THEIR BIT AND GET THEM HERE,I"D BE RIDING!!!!>:-/ ).

You're right you can have an acceleration advantage, but gear ratios can affect your cruise effort w/a pack. I used to push a 54T on a mtb & slicks.

Depending on availability, triathlon 650C wheelsets will work on a mtb w/canti bosses perfect. Not very popular but still widely available & I've got many from bike shops at a severe discount because they wanted to get rid of them. Chuck's Bicycle Closeouts has wheelset and tires for great price.
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Old 09-01-07, 05:26 AM   #15
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Originally Posted by xclam View Post
I own a Gary Fischer hardtail MTB with 26-1.75 tires on them. My wife recently got a new roadbike and no longer rides her hybrid which have 700-28 tires on them. I am doing a metric century this coming weekend and was thinking of ways to increase my speed (with the use of my MTB).

Do you think I can switch the hybrid tires to my MTB? I believe the OD of the tire is about the same so the only real issue would be to re-adjust the brakes to grab a skinnier rim. Both my MTB and my wife's Hybird have the same 7-speed rear cassette so I think the gearing will be no issue.

Your collective thoughts???

It very well may be that the frame (fork and rear stays) will accept the larger diameter of the 700C wheel, BUT yor V-brakes won't "catch" the rim - the brake bosses are too low (too close to the center of the wheel, to be precise) for ordinary V-brakes to work. There is one model of V-brakes that would do the trick, but it costs so much, you could buy a new frameset for that money.

Now, if the wheels could take diskbrakes, and your bike was diskbrake ready, too, and you would want to actually invest in a set of diskbrakes, that would be just very little bit cheaper than the special V-brakes I mentioned above.

In addition to these brake problem, you have to take into account that the geometry will be all fuffed up - the BB is higher on MTB bikes already, and by adding larger wheels, it will be uncomfortable. The wheelbase will be the same, but the trail will be larger, and significantly change the handling of the bike - it will corner MUCH slower. On the other hand, it will be the perfect bike for when you're intoxicated - very stable

Last edited by wroomwroomoops; 09-01-07 at 06:20 AM.
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Old 09-01-07, 05:28 AM   #16
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The outer diameter of the tires may be nearly the same but the inner diameter of the tires (and the diameter of the rims) is a complete non-match.

700c rims are 622mm in diameter, 26" rims are 559mm in diameter.

Your brake pads would have to move 31mm (or about 1 1/2 inches) away from the hub in order to meet the rim. (31.5mm difference in radius for 63mm difference in diameter for the switch in rims).

what he said!
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Old 09-01-07, 05:50 AM   #17
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It very well may be that the frame (fork and rear stays) will accept the larger diameter of the 700C wheel, BUT yor V-brakes won't "catch" the rim - the brake bosses are too low (too close to the center of the wheel, to be precise) for ordinary V-brakes to work. There is one model of V-brakes that would do the trick, but it costs so much, you could buy a new frameset for that money.

Now, if the wheels could take diskbrakes, and your bike was diskbrake ready, too, and you would want to actually invest in a set of diskbrakes, that would be just very little bit cheaper than the special V-brakes I mentioned above.

In addition to these brake problem, you have to take into account that the geometry will be all fuffed up - the BB is higher on MTB bikes already, and by adding larger wheels, it will be uncomfortable. The wheelbase will be the same, but the trail will be larger, and significantly change the handling of the bike - it will corner MUCH slower. On the other hand, it will be the perfect bike for when you're intoxicated - very stable
I have no idea why you replied to my post regarding this-
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Old 09-01-07, 06:20 AM   #18
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I have no idea why you replied to my post regarding this-
D'oh! Sorry, corrected it now!
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Old 09-01-07, 06:28 AM   #19
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Nashbar has a housebrand tire in 26x1.25" that is rated to a maximum of 85 psi. It actually measures about 30 mm as installed so it's not significantly wider than the 700x28 tires on your wife's hybrid.
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Old 09-01-07, 06:42 AM   #20
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D'oh! Sorry, corrected it now!
No prob.
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