's Forum Archives - Components

Archive Home >> Components(1 2 3 4 5 6 7 8 9 10 )

Tandem Tire Size?(9 posts)

Tandem Tire Size?yfoiler
Nov 9, 2002 11:35 AM
I'm 160 Lbs, my stoker (wife) is 100 Lbs.
I'm building up a 7005 AL tandem.
So I guess the "all up" weight will be just over 300 Lbs including bike and gear.

I have quite a few 700x23 Vittoria Open Corsas already.
Can I use these tires? Or must I go to 700xlarger?
Any suggestions?

Thanks for any help.

I would strongly suggest......gogene
Nov 9, 2002 11:40 AM LEAST a 700x25 or better a 700x28 for any tandem, regardless of total weight. I use x28's on my alu tandem.
I would strongly suggest......yfoiler
Nov 9, 2002 11:58 AM
Why? The 700x23 Vittoria's are certainly stronger in thread count than any of the larger tire sizes.
So instead of strength do we need more suface contact with a larger thumbprint? Is that the main reason?

I can think of a couple of reasons.......gogene
Nov 9, 2002 3:05 PM
.....among them tire pressure. To keep the tire load capacity with the weight of a tandem, you have to use higher pressures, more than the usual pressures used with a solo bike. With higher pressure comes harsher ride (even with Vittorias, my fave for solos), much greater risks of severe cuts or flats. With higher tire pressures, you may exceed the rim manufactureres limits. Some rim manufactures, Mavic for instance, publish a max pressure for their rims.

Thread count has little to do with stregth per se, more to do with ride quality. If you contacted Vittoria, I doubt they would recommend their tires for a tandem.

My main issue with using x23 tires is the quality of the ride. Regardless how good the Vittorias are on a solo, I think they would ride pretty crappy if you inflated them to the psi necessary to carry 300+ pounds around all day long.

Also, you should consult with the maker of your frame, and barring that, consult with the maker of ANY quality frame regarding their choice of tire size.
I can think of a couple of reasons.......yfoiler
Nov 9, 2002 3:12 PM
Thanks for the input. Your reasons make more sense now that I think about it.

I've ridden the Vittoria's (tubulars and opens) for so long It'll be hard to find a larger tire for the tandem that will be in that class. I'll get in touch with one of the tandem websites. I'm sure they can offer up a suggestion.

You'll find that a tandem is a whole different world.gogene
Nov 9, 2002 3:28 PM
I don't think you would notice some of the subtle differences in tires, like you would on a solo. You would be surprised how much 'spring' a good tandem frame has, and that can smooth the ride considerably.

I think the big considerations for tandem tires are load capacity, longevity and grip among other things.

Here's some handy tandem sites:

BTW, I sold my Y-Foil earlier this year. I really miss it. The second most sexy thing on the planet.
I just looked at Mavic's website.......gogene
Nov 9, 2002 3:14 PM
....and for their T520, the only rim they certify for tandems, the max inflation pressure for a x28 tire is 103psi.

Remember, the rim is part of the pressure equation too. Some rims have been know to split under too much pressure.
Gave up your Y-Foil eh?yfoiler
Nov 11, 2002 12:31 AM
Don't think I could bring myself to part with my "foil"...
I can think of getting or building other bikes by my "Y" is a keeper for sure.

Just in case you want to stay in touch with the Y crowd here's a link:

Thanks for the tire help.

I loved my 'Foil......gogene
Nov 11, 2002 8:10 AM
.....and I was one of the early members of the Y-Foil Group. My pics are posted there, under Dave's 'Foil and Final Build.