downtube thick

Page may contain affiliate links. Please see terms for details.
alrzaln

alrzaln

Regular
Location
tehran
I recently bought a aluminum GIANT TCR bike
Does anyone know how thick the wall of downtube is?
Shvk4g1C1A_gO4JrFR9Sm8X1wbQoZyzaybLXVSESeZU-2048x1152.jpg
 
fossyant

fossyant

Ride It Like You Stole It!
Location
South Manchester
Manufacturers never tell you for generic stuff. It won't be thick. I could tell you what 531/653/SLX tubing is as the manufacturers published that for steel

For example, Columbus SLX is butted and rifled. It's 0.9mm at the ends and 0.6mm in the middle. Add on rifle reinforcement at the lugs.

Generic alloy frames, it's rarely published. You are looking at a couple of mm maximum.
 
Drago

Drago

Legendary Member
Location
Suburban Poshshire
I don't think anyone here can say for sure, but if it's butted then at the mid point 1mm or less is likely.

Fery high quality steel frames can go as low as 0.6 or even 0.4mm at that point, but alu needs to be thicker for obvious reasons.

Chop it in half and let us know!

Our very own forum mad scientist @mickle might have some experience of this?
 
OP
OP
alrzaln

alrzaln

Regular
Location
tehran
fossyant said:
Manufacturers never tell you for generic stuff. It won't be thick. I could tell you what 531/653/SLX tubing is as the manufacturers published that for steel

For example, Columbus SLX is butted and rifled. It's 0.9mm at the ends and 0.6mm in the middle. Add on rifle reinforcement at the lugs.

Generic alloy frames, it's rarely published. You are looking at a couple of mm maximum.
Click to expand...

I also have a GIOS TORINO with a COLUMBUS SL frame and the info you gave me is helpful🙏
 
Yellow Saddle

Yellow Saddle

Guru
Location
Loch side.
fossyant said:
Manufacturers never tell you for generic stuff. It won't be thick. I could tell you what 531/653/SLX tubing is as the manufacturers published that for steel

For example, Columbus SLX is butted and rifled. It's 0.9mm at the ends and 0.6mm in the middle. Add on rifle reinforcement at the lugs.

Generic alloy frames, it's rarely published. You are looking at a couple of mm maximum.
Click to expand...

Less than 1mm for the frame triangle, with about 1mm at the ends. More than 1mm only on the head tube, BB, drop-outs and chainstays.
 
OP
OP
alrzaln

alrzaln

Regular
Location
tehran
I like Skol said:
Got to ask, but why do you need/want to know? It is a largely irrelevant specification for nearly all end users. More useful to know is geometry and feel, and maybe frame weight if you are that way inclined.
Click to expand...

It's interesting that you asked that. I'm looking to see if I can use Revnut or Plusnut to connect the bootle cage to the downtube
 
cyberknight

cyberknight

As long as I breathe, I attack.
Location
Land of confusion
Last edited:
Bristolian

Bristolian

Über Member
Location
Bristol, UK
If you really want to know the thickness of the tubes and don't want to cut them up to find out then you'll need an ultrasonic thickness gauge. You can buy them on Amazon but I have no idea how accurate they are as I've never used one.

Alternatively, one of my ex-employers make a tube wall thickness gauge that used Gamma rays from a 10 Curie Caesium 137 source shrouded in depleted Uranium and Lead. I can vouch for the fact that is very accurate but it's rather expensive at around £500,000 and you'd have to be prepared to wait about 2 years for them to deliver one - 10Ci Cs137 pellets are rarer than rocking horse manure. Then there's the issues of licensing its use, somewhere safe to install it, a certified Radiological Protection Advisor to okay the installation, etc, etc, etc, ... the problems are endless. Personally I'd go for the Amazon special :okay:
 
You must log in or register to reply here.
Top Bottom