what is the difference between a 8mm and 10mm hex key?

[ianrauk]

Would help if i upload the image... View attachment 61545

Aha..one of those BB30 jobbies.
That's why I was asking what BB it is.

And blow me down with a feather - just checked my commute bike which has an FSA crankset and it does need a hex key too.

Learn something new every day with this bike business.
I am so used to Shimano cranksets.

 

[Turbo Rider]

I'm going to ask Santa for a big box of bike tools...and then I'm going to never use them, though I will, of course, refuse to let anyone else use them. This will make me happy

 

[SatNavSaysStraightOn]

Owwww now there is a good idea for a Christmas present. My oh keeps pestering me about what I want for Christmas and we now have 2 bikes with hollow tech BB that I currently have no way of removing... That and a good bike specific tool set would make for an great Christmas present.... Thank you

 

[winjim]

Campagnolo Ultra Torque takes a 10mm hex.

 

[subaqua]

Owwww now there is a good idea for a Christmas present. My oh keeps pestering me about what I want for Christmas and we now have 2 bikes with hollow tech BB that I currently have no way of removing... That and a good bike specific tool set would make for an great Christmas present.... Thank you

decathlon in warrington have a good selection of bike tools as individual items or you could buy the made of cheese kit

 

[gaz]

Assuming it's a serious question, it does just refer to the width of the bolt. So a 10mm hex really is 2mm wider than an 8mm.
A local hardware store should have a selection of hex keys for a reasonable sum, I personally prefer those that either fold out of a tool (as long as its good quality) or come in a case so that they can all be returned to their rightful places when finished with otherwise I instantly lose them!
Do you not have a bike multi-tool type thing with hex keys on?

EDIT: Also have a search on Youtube, there are loads of really good tutorials out there for replacing/servicing BB's

FYI: It actually doesn't refer to the size of the bolt, just the size of the hex key and what size hole it fits in. An M6 bolt can have a 6mm hex hole and another M6 bolt can have an 8mm hex hole.

 

[Panter]

FYI: It actually doesn't refer to the size of the bolt, just the size of the hex key and what size hole it fits in. An M6 bolt can have a 6mm hex hole and another M6 bolt can have an 8mm hex hole.

Sorry, yes, my typo. Should have said "key," not "bolt."

Even bolt would've been wrong though, aren't they actually called cap head screws or something?

 

[raleighnut]

Heres a google image basically you tap the driveside through the bb and then tighten the non driveside with a 10mm allenkey i think all fsa cranks are like that

The ones with the self-extractor are, some Truvativ looked similar on an Isis BB.
EDIT - The Campagnolo cranks also use a 10mm allen key bolt but that is right in the centre of the crank and a standard key isn't long enough you need a 'special tool', or a 10mm ring spanner slid onto the long arm of a 10mm key for leverage.

 

[Levo-Lon]

If you go down the cheap cheese tools for xmas ,do check the walk in centre is open over xmas if you play with your nuts xmas morning..

£50 to £75 will get you a nice kit..the Aldi £17 one will do but you pay your money and take your chance..

 

[jack smith]

My aldi one has lasted me multiple bike builds and a year of maintenence only thing that failed was the chain tool that snapped forst time

 

[KneesUp]

My aldi one has lasted me multiple bike builds and a year of maintenence only thing that failed was the chain tool that snapped forst time

I bent the pin on my chain tool too - I thought I was just clumsy. The 10mm spanner in mine seems to be very slightly smaller than 10mm too - otherwise it's good.

 

[Venod]

I bent the pin on my chain tool too - I thought I was just clumsy. The 10mm spanner in mine seems to be very slightly smaller than 10mm too - otherwise it's good.

Perhaps its a big 9mm spanner.

 

[hennbell]

I'm going to try and replace my bottom bracket for the first time but first I need to buy some tools. Any advice would be welcome I have a specialized sirrus sport 2014 if there is anything to watch out for please let me know?

If there is an issue with the BB as it is a 2014 is it not under warrenty? have the shop do it. A BB replacement is not your typical weekend mechanic job, but I am sure you could do it.

 

[KneesUp]

Perhaps its a big 9mm spanner.

If that is the case it was very misleading of them to stamp 10mm on it

 

[shouldbeinbed]

If you go down the cheap cheese tools for xmas ,do check the walk in centre is open over xmas if you play with your nuts xmas morning..

£50 to £75 will get you a nice kit..the Aldi £17 one will do but you pay your money and take your chance..

My aldi one has lasted me multiple bike builds and a year of maintenence only thing that failed was the chain tool that snapped forst time

I must be a heavy handed galoot, the Aldi bike kit is the only cycling buy from there that I have ever regretted. I hoped it would give me a passable all in one place general purpose kit to augment the individual tools and bits I've collected over the years but can never put my hand on when I need them, but it does seem very soft and bendy stuff. The box has more replacement tools in it than original now.