fixing a drilled frame
12-07-23, 07:58 AM
#26
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12-07-23, 09:46 AM
#27
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speaking of the wich, i have another bike branded toMasini (yes one M). In the past someone told me that frame use columbus tubes but the logo is missing. is possible to recognize the tubing?
12-07-23, 09:56 AM
#28
I don't know.
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you are right, that's first spot on the cringe list alright. eesh.
12-07-23, 10:38 AM
#29
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There is a technical way to identify alloy composition but its not common outside of steel mills and scrap yards. It's called X-ray Fluorescence. The analyzer costs about $10,000. View is probably not worth the climb.
Regarding the OP, Falck made some good tubes and Legnano used them in some high-end bikes (e.g. Campagnolo Gran Sport) so perhaps another way to assess the frame quality is by inference. Is the crank alloy? What brand? If the crank is a machine-lightened version of the campy Nuovo Record, and the handlebars and stem are Cinellli alloy, and the seat post is campy alloy and the seat is a brooks professional.. This may indicate a high end bike with frame to match. If the crank, stem, and handlebars are all steel then one might infer a more plebian model.
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12-07-23, 12:14 PM
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What's the purpose of the repair?
To prevent frame failure or future cracking?
To prevent corrosion?
Improve looks?
If you want to keep the water bottle cages, your idea on rivnuts is really the best option.
If the any of the holes is a little off, you can slightly larger hole to properly center it and install a slightly oversized rivnut
(last resort)
Welding just seems unnecessary
(especially if aluminum)
To prevent frame failure or future cracking?
To prevent corrosion?
Improve looks?
If you want to keep the water bottle cages, your idea on rivnuts is really the best option.
If the any of the holes is a little off, you can slightly larger hole to properly center it and install a slightly oversized rivnut
(last resort)
Welding just seems unnecessary
(especially if aluminum)
12-07-23, 01:01 PM
#31
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Sometimes you can find manufacturer markings on the tubes. Columbus and Reynolds used to stamp their tubes, but these marks are sometimes lost when the tubes are trimmed for the frame. Places to look are chainstays near the bottom bracket, the base of the seat tube, the tops of the fork blades. Steer tubes are also often marked near the crown end. Ribs inside the steer tube may also indicate tube type: Five helical ribs are Columbus, five straight ribs Ishiwata, and six helical ribs Tange or Vitus. N.B. Columbus changed from stamping to graphite discharge marking in the mid 80s; pain will completely obscure this type of mark.
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12-07-23, 02:31 PM
#32
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Sometimes you can find manufacturer markings on the tubes. Columbus and Reynolds used to stamp their tubes, but these marks are sometimes lost when the tubes are trimmed for the frame. Places to look are chainstays near the bottom bracket, the base of the seat tube, the tops of the fork blades. Steer tubes are also often marked near the crown end. Ribs inside the steer tube may also indicate tube type: Five helical ribs are Columbus, five straight ribs Ishiwata, and six helical ribs Tange or Vitus. N.B. Columbus changed from stamping to graphite discharge marking in the mid 80s; pain will completely obscure this type of mark.
12-07-23, 02:32 PM
#33
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What's the purpose of the repair?
To prevent frame failure or future cracking?
To prevent corrosion?
Improve looks?
If you want to keep the water bottle cages, your idea on rivnuts is really the best option.
If the any of the holes is a little off, you can slightly larger hole to properly center it and install a slightly oversized rivnut
(last resort)
Welding just seems unnecessary
(especially if aluminum)
To prevent frame failure or future cracking?
To prevent corrosion?
Improve looks?
If you want to keep the water bottle cages, your idea on rivnuts is really the best option.
If the any of the holes is a little off, you can slightly larger hole to properly center it and install a slightly oversized rivnut
(last resort)
Welding just seems unnecessary
(especially if aluminum)
still i'am undecided what to do
