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Is a 44mm DT on frame going to kill?
 

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Sparky
Joined: 08 Dec 2003
Posts: 16693
Location: Portland, OR

8/13/18 6:28 PM

Is a 44mm DT on frame going to kill?

Custom GURU Ti frame I have in my reach. I am kind of concerned with a 44mm round DT it may be so brutally stiff, even being Titanium, I might rue the purchase.

Opinions?

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dfcas
Joined: 11 Jan 2004
Posts: 2500
Location: hillbilly heaven

8/13/18 8:43 PM

My custom Carver has a Butted 44mm downtube. Not too harsh, but I have no idea if I would have liked a smaller tube better.

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Sparky
Joined: 08 Dec 2003
Posts: 16693
Location: Portland, OR

8/13/18 8:55 PM

And you are a 59-60 as I recall.

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dfcas
Joined: 11 Jan 2004
Posts: 2500
Location: hillbilly heaven

8/13/18 9:02 PM

Carver suggested it was appropriate for a big frame and somewhat heavy rider.

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greglepore
Joined: 10 Jan 2004
Posts: 1632
Location: SE Pa, USA

8/14/18 6:52 AM

No. I have one on a custom ti in a sloping bike set up for a 5'5 rider. Its not "harsh" but its definitely not as buttery as conventional ti. On my build the seatstays make up for it. I'd try the guru if it fits.

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LeeW
Joined: 13 Jan 2004
Posts: 348
Location: near Baltimore, MD

8/14/18 7:12 AM

I once had a '99 Litespeed Ultimate that had the thick, roughly-airfoil shaped downtube (that was made out of sheet titanium bent around a form and welded at the bottom. It did not ride overly stiff.

Give it a try if you're interested.

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Sparky
Joined: 08 Dec 2003
Posts: 16693
Location: Portland, OR

8/14/18 2:16 PM

I honestly thought I'd be asking "you calling me fat?" by now in this thread. ;)


It sold before they answered any questions. Not the first time The Pro's Closet questions went unanswered either. Maybe better not to deal with them, if they don't service ahead of a purchase, I doubt after will be better...

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Nick Payne
Joined: 10 Jan 2004
Posts: 2377
Location: Canberra, Australia

8/14/18 4:03 PM

My Lynskey Sportive in XL size has a 45mm DT, and it's not harsh to ride (I use Schwalbe S-One 30mm tubeless tyres on it). I also have a Lynskey GR Pro which has the blunt-nosed triangular DT formed from 6-4 Ti sheet, but with 48-50mm tyres at 25-35psi on that bike, frame rigidity doesn't really come into the comfort equation.

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Sparky
Joined: 08 Dec 2003
Posts: 16693
Location: Portland, OR

8/14/18 6:13 PM

Nick, is the sportive disc or rim brakes? If rim, does it need 57mm mid reach calipers?

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Nick Payne
Joined: 10 Jan 2004
Posts: 2377
Location: Canberra, Australia

8/14/18 10:36 PM

The Sportive I have is the rim brake version, and uses short reach calipers (SRAM Force). I doubt that a 30mm tyre would fit in the front with a carbon fork - I'm using a steel fork which has the hole for mounting the brake bolt closer to the bottom of the fork crown than does a carbon fork.

I forget exactly how old my frame is - I bought it about four years ago, I think - the model I bought was the last one where they made the frame with straight headtube for 1-1/8" steerer fork. All the more recent models have tapered headtube for tapered steerer.

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