Old 08-21-20, 01:22 PM
  #4  
Iride01
Hits [ENTER] b4 thinking
 
Iride01's Avatar
 
Join Date: Jul 2017
Location: Mississippi
Posts: 8,217

Bikes: '20 Tarmac Disc Comp '91, '78 Raleigh Competition GS

Mentioned: 34 Post(s)
Tagged: 0 Thread(s)
Quoted: 3236 Post(s)
Liked 1,830 Times in 1,299 Posts
Can't tell for certain in the pic, but if you don't have a cover, it is either missing or these aren't self extracting cranks.

Cover is essentially a disk with a big hole that threads onto the crank. The hole will be big enough to let you put a tool, hex key in your case, through it and into the socket of that bolt. Some covers use just a size or two bigger hex keys. Others might use something else like a pin spanner and hex key combo like below.

Iride01 is offline