This can be changed in the templates just look for these functions in your templates and set $size to the integer you would like:
post_author_avatar($size)
post_author_avatar_link($size)
bb_get_avatar( $user->ID, $size )
		
	 
	
	
	
 
		
			
	
	
		
		Hi,
I couldn’t find this anywhere in the code, do you know which file exactly?
I did search within folder via Dreamweaver. 
I really would love to have a fixed size for avatar
		
	 
	
	
	
 
		
			
	
	
		
		Or do you mean I have to change this code:
<?php post_author_avatar_link(); ?>
Into:
<?php post_author_avatar_link($size:width=80px; height=80px;); ?>
I don’t know exactly how to do that
		
	 
	
	
	
 
		
			
	
	
		
		Okay here’s what I did:
I changed:
<?php avatarupload_display(get_post_author_id()); ?>
Into:
<?php avatarupload_display(get_post_author_id($size=80)); ?>
In my post.php (in bb-templates/templatename/)
But since it had only mine avatar with that size, all avatar from other members are showing mine avatar. 
I don’t know where to fix that.
		
	 
	
	
	
 
		
			
	
	
		
		Ok, sorry to post again, I found a solution via css, I know it’s not the best solution 
 but it works I guess.
I did this:
img.avatar { border: medium none; width:80px; height:80px;  }
		
	 
	
	
	
 
		
			
	
	
		
		Hey there!
I found a solution by checking out how to tweak the avatar size for standard Gravatars in WordPress and then applied it to the BBPress code like so:
<?php post_author_avatar_link(‘avatar_size=100’); ?>
I know it’s 2 years ago someone posted, but I figured it might be useful to somebody