Schwinn Alloy Stem Bolt
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System Message: The most recent update appears to have broken images, unfortunately it looks like another code deploy will be needed to fix it. I hope to have that done by late Tuesday evening US Central Time. Posted: 08/19/25 06:24 AM CST
Main Photo
Photo Credit: VeloBase User simplex56
Category:  Small Parts & Accessories
Name:  Schwinn Alloy Stem Bolt
Brand:  Schwinn
Model:  55-687
Years:  N/A
Country:  United States
Weight:  27 grams
Added By: simplex56 on 01/31/09
Updated By: simplex56 on 01/31/09
Additional Photos - click for full size
Schwinn Alloy Stem BoltSchwinn Alloy Stem BoltSchwinn Alloy Stem Bolt
 Verify Component Photos
Part Type Other AccessoriesIdentifying Markings None
MaterialAluminum AlloyLocation 
General Information

Overall length 144mm.  Shank dia = 8mm.  Head dia = 12mm.  Uses 6mm hex key.  Wedge nut dia = 20mm (max).

Total Weight = 27 grams. (vs. 61g for steel. Save 34g!)

NOTE: Pictures 2 & 3 show a typical steel bolt set above, and the aluminum beneath.  The steel bolt set, taken from a Cinelli stem, has a smaller shank dia (7mm), with coarser thread, and a slightly smaller bolt head diameter (11.75mm).  These minor differences do not prevent the alloy bolt set fitting just fine in the Cinelli stem.  To avoid damage to the alloy bolt, some folks used to draw the nut home using a steel bolt, and then replace it with the alloy bolt.  Obviously, this could not be done here, as the alloy set uses a larger diameter shank and finer thread to help withstand the stress of tightening.  Still, you'd want to lightly grease the parts and be careful not to over-torque the alloy bolt.

Quality:Not RatedRarity:Not Rated
   
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