Solved: Tight Chainstays - Tubular vs. Clincher

[Clean39T]

EDIT - solved, thanks for the input - pics of the build shortly..

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Recently acquired a Coors Serotta that is beautiful but has limited tire clearance at the seat-tube due to 40cm stays and the OS swaged seat-tube.

The pic shows a 25mm Vittoria tubular, fully inflated.

Now the question: will any/all of the following give me meaningfully different clearance compared to that 25mm tubular?

1. 23mm tubular on wide HED Stinger 4 rim
2. 23mm clincher on C15 Campy
3. 23mm clincher on C17 Campy
4. 24mm clincher on C17 Campy
5. 25mm clincher on 19mm ID rim

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[David Kirk]

Are you talking about width or height of the tire?

dave

[Clean39T]

Originally Posted by David Kirk

Are you talking about width or height of the tire?

dave

Height. There's more than enough width clearance. Curious if a tubular sits more proud above the rim bed compared to a clincher and don't have any 23mm tubulars to try out.. I know a wider ID rim pulls down the height of the tire a bit too.

Since I regularly end up on roads that have a bit of wet followed by roads with cinder, I don't want to push the clearance too much and have that gorgeous paint get eaten away or worse.

[Clean39T]

May have answered my own question here. Pic below is 25mm Vittoria on HED Stinger 4. That seems like enough clearance.. no?

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[mktng]

If you're not near to rubbing on the chainstays. That looks fine.

[joevers]

Originally Posted by Clean39T

I'd definitely be comfortable with that.

Something with around 21mm of internal width is definitely enough for tires to measure noticeably less tall. I think Bicycle Rolling Resistance actually measures the height and width of tires they test, so you can compare different brands.

[Tickdoc]

Veloflex.

Love that bike and getting away from the "as indicated" proper sizing of Vittoria clinchers to the "at least one size smaller than advertised" veloflex will give you both the clearance you need and at least the suggestion of running a larger tire.

Haven't tried veloflex tubulars yet (have a fait ready to mount for spring) but I know my vittoria tubulars seem beefy.

[robt57]

Originally Posted by Clean39T

Height. There's more than enough width clearance. Curious if a tubular sits more proud above the rim bed compared to a clincher and don't have any 23mm tubulars to try out.. I know a wider ID rim pulls down the height of the tire a bit too.

Since I regularly end up on roads that have a bit of wet followed by roads with cinder, I don't want to push the clearance too much and have that gorgeous paint get eaten away or worse.

Fattest rim you can get in there will make tire less tall. Also putting a piece of helicopter tape on the back of the ST may avert or lessen/insulate perhaps a little boulder getting to the metal...

Clincher too. When I did up the 30mm Stada tubeless tubulars I learned that even on a 26.4mm wide rim, air pushes the tire taller, not wider.

The prescription might be a 700x21c rim with a 25-27, or a true size 28 most?? Clincher...

[Clean39T]

Originally Posted by robt57

Fattest rim you can get in there will make tire less tall. Also putting a piece of helicopter tape on the back of the ST may avert or lessen/insulate perhaps a little boulder getting to the metal...

Good reminder. Thankfully it's a braze-on FD too so no further interference from a clamp..

[Clean39T]

Originally Posted by mktng

If you're not near to rubbing on the chainstays. That looks fine.

Not even close at the chainstays.

[robt57]

Originally Posted by Clean39T

Good reminder. Thankfully it's a braze-on FD too so no further interference from a clamp..

I have used Parlee FD clamps to avert that in the past.


I'd add that you haven't lived until you've run a 30mm tubular, and the Strada B is not exactly a flexible casing either, but boy that is a nice glide I can attest to.

Do you want me to measure out the glued/inflated 25mm LGG toobie dimensions let me know.

[Clean39T]

Originally Posted by robt57

I have used Parlee FD clamps to avert that in the past.





I'd add that you haven't lived until you've run a 30mm tubular, and the Strada B is not exactly a flexible casing either, but boy that is a nice glide I can attest to.



Do you want me to measure out the glued/inflated 25mm LGG toobie dimensions let me know.

I think I'm good but thanks for the offer.

This is a race bike, so <25mm true size is what I'm after anyway..

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[Matthew]

Enough talk about tire size, let's see the bike damn it!! One of my all time favorites.

[NHAero]

Dan, it makes me think of the old tire savers we ran BITD on our tubulars. Scrape off the offending grit before it gets to the seat tube!

[robt57]

Originally Posted by NHAero

Dan, it makes me think of the old tire savers we ran BITD on our tubulars. Scrape off the offending grit before it gets to the seat tube!

I recall leaning the hard way not to let those stay on after they wear flat into little knives.

They started with a little tube that lasted a few days, then wore into little blades if you left them on too many miles, LOL.