Minimum stem engagement on alloy steerer?

[cycling weakly]

I know that it is recommended to have the top of the steerer tube about 5mm below the top of the stem, but I have just swapped a fork from another bike & the best I can get is 13mm. This leaves 27mm of the steerer gripped by the stem. Any thoughts on the safety or otherwise of this setup?.

Steve

 

[Deleted member 4366]

Can't you get a narrower stem? 40 mm seems pretty high. I have some around 30mm.

 

[cycling weakly]

Hi Dave. Do you know what make & model the 30mm high stems are?. I have done the rounds of the lbs's & the only stem under 40mm I came across was a Deda Newton lightweight road stem which was 37mm tall & too frail looking for offroad.
Steve

 

[soundwave]

http://www.chainreactioncycles.com/stems?f=2258

 

[cycling weakly]

Thanks for that SW. I am now mulling over buying a used Fox Float 100mm fork with a longer steerer, for £150. Or putting the BBS02 into a Whyte 605 that is gathering dust in my kitchen. My indecision is final!.
Steve.