Bash ring compatibility sanity check!

Corners R Us

Shimano LX hollowtech cranks set (vintage unknown!), triple ring setup currently.

Plan to remove outer ring and apply one of these as I never use the outer ring off road:

http://www.ebay.co.uk/itm/160971367970? ... 1423.l2649

Whilst this ad doesn't specifically state 104 bcd I'm sure thats what the Hope ones are.

Am I correct in thinking all Shimano or at least my cranks are 104 bcd? Measuring crank bolt centre to bolt centre seems to be 114mm. Is the 104 bcd measured to the edge of the spider?

I'm pretty certain this will be fine but need a sanity check as per the title!

Another presumption....the chain ring bolts will be long enough won't they?

Cheers, Corners

nicklouse

LX cranks did come with a number of BCDs but if 4 arm then it should be 104mm but a part number will help ID that or a picture.

and yes hope only do 104mm at the moment
http://www.hopetech.com/page.aspx?itemID=SPG345

Corners R Us

FC-M580 stamped on the inside of the chainring side crank arm, FC-M 580/581 on the inside of the left crank.

Cheers, Corners

Corners R Us

http://techdocs.shimano.com/media/techd ... 608889.pdf

104 BCD confirmed I think! Thanks for pointing me in the right direction!

Corners

The Rookie

For ref that is Hollowtech2, not Hollowtech... (Hollowtech just actually referring to hollow arms).

Corners R Us

The Beginner wrote:

For ref that is Hollowtech2, not Hollowtech... (Hollowtech just actually referring to hollow arms).

Thanks for clarifying. I'm coming from old school land of hardtails, 8 speed and square taper axles so this array of 'modern' kit is all a bit bewildering! I'm now trying to work out which tool I need to buy to remove the end cap to enable me to take the cranks off to fit a bash gaurd!! One of these?

http://www.chainreactioncycles.com/Mode ... delID=3785

To make matters more confusing I have a mates 2009 FSR XC sat in my garage and his has Hollowtech II XT cranks on it but the centre nut looks slightly different to mine! I think he has a tool to remove it so I'll try his first.....or do it without removing the cranks as it looks like I can access the bolts sufficiently!!

Then theres shock pumps, air pressures, sag and lots of fast/low speed compression to understand on the shocks on my new steed........

Corners the confused one!

cooldad

Read Parktools link below first. Info on everything.
The end cap you refer to is actually to pre load the bearings, like a headset topcap.

Corners R Us

cooldad wrote:

Read Parktools link below first. Info on everything.
The end cap you refer to is actually to pre load the bearings, like a headset topcap.

Cheers for pointers. I watched a YouTube video last night so have an idea as to whats what. Looks simple enough if you remember to remove the tab in the split in the cranks! My terminology might be a bit off as all this tech is relatively new to me! Looks like the cap is only hand tight anyways and as you say just to pre load the external (correct?) bearings.

I'll have a read of the Park Tools link and bookmark it for future reference.

Thanks again. Corners

The Rookie

You don't need to remove the cranks to fit a bash, can all be done in situ......allen key in the front, screwdriver (if needed at all) across the frame into the back.

Corners R Us

The Beginner wrote:

You don't need to remove the cranks to fit a bash, can all be done in situ......allen key in the front, screwdriver (if needed at all) across the frame into the back.

Thanks for confirming, I thought as much but it was a bit late last night to break out the tools in the murk in the garage! I have a chainring bolt screwdriver already in the tool kit to do the job justice! Now to order a loverly red Hope bash gaurd for a splash of colour and protection!!

Corners