Just like the ones with steel spindles but... you know... TITANIUM!<br /><br />Enduro 3903 LLU bearings these BB's are sure to stand up to the abuse of daily street use. We didn't check only the spindle only, but the whole setup came in at 162 grams (That's a savings of... count 'em... 64 grams!) Use the bolts from your existing cranks, or <a href="http://www.benscycle.net/index.php?main_page=product_infocPath=188_247_677products_id=1479" target="_blank">these</a> if you lost yours. No proprietary tools needed, <a href="http://www.benscycle.net/index.php?main_page=product_infocPath=270_276products_id=766" target="_blank">Park BBT-22</a> and <a href="http://www.benscycle.net/index.php?main_page=product_infocPath=188_234products_id=2598" target="_blank">any</a> <a href="http://www.benscycle.net/index.php?main_page=product_infocPath=188_234products_id=903" target="_blank">lockring</a> <a href="http://www.benscycle.net/index.php?main_page=product_infocPath=188_234products_id=902" target="_blank">tool </a>is all you need to install this BB. The taper on these is JIS, BTW. That's common to Shimano and others, but will not work with "Campy" taper, AKA, ISO.