belga Posted October 29, 2009 Report Share Posted October 29, 2009 Hi guys (and girls, if that applies)!Long story made short: I bought a specialized P1 2009 in the first week of September this year after having my previous bike stolen. And now (surprise surprise ) the P1 got stolen a few weeks ago (October 8th). And so i have just completed the little song and dance-number required by my insurance-company and today i picked up my new bike. There where no P1's left, so i got the dealer and my insurance-company to approve a slightly customized 2008 Giant STP SS as a replacement (exact words where that i would get a P1 or something equal, but the STP where cheaper so i was allowed to add stuff to match the prize of the P1).For those who are interested the "slightly customized" part means the dealer where kind enough to swap out the fork for a rigid one from a STP1 he had (The SS where originally fitted with a Marzocchi DJ-fork). He also swapped the original Stroker mechanical discbrakes for a set of Hayes El Camino fluid brakes. I also got a Truvativ Hussefelt 2009 riser bar and a pair of Wellgo B66 Pedals.Anyways, the question i had (and hoping someone here can answer) is regarding the BB and cranks. The guy at the dealer (really nice guy btw) said the BB is one of Truvativ BB's and the bike specs on Giants site says "truvativ ISIS external, dual bearing". When i asked about the cranks the guy at the dealer said that if i wanted to swap them out i would have to pick something from the Hussefelt series as Truvativ had som special spline version going on (Howitzer?). Is there anyone that can clarify this? Will any regular ISIS spline cranks fit or do i have to change out the BB/use Hussefelt-series cranks to make it fit?Cheers! Quote Link to comment Share on other sites More sharing options...
totaltrials Posted October 29, 2009 Report Share Posted October 29, 2009 (edited) Hi guys (and girls, if that applies)!Long story made short: I bought a specialized P1 2009 in the first week of September this year after having my previous bike stolen. And now (surprise surprise ) the P1 got stolen a few weeks ago (October 8th). And so i have just completed the little song and dance-number required by my insurance-company and today i picked up my new bike. There where no P1's left, so i got the dealer and my insurance-company to approve a slightly customized 2008 Giant STP SS as a replacement (exact words where that i would get a P1 or something equal, but the STP where cheaper so i was allowed to add stuff to match the prize of the P1).For those who are interested the "slightly customized" part means the dealer where kind enough to swap out the fork for a rigid one from a STP1 he had (The SS where originally fitted with a Marzocchi DJ-fork). He also swapped the original Stroker mechanical discbrakes for a set of Hayes El Camino fluid brakes. I also got a Truvativ Hussefelt 2009 riser bar and a pair of Wellgo B66 Pedals.Anyways, the question i had (and hoping someone here can answer) is regarding the BB and cranks. The guy at the dealer (really nice guy btw) said the BB is one of Truvativ BB's and the bike specs on Giants site says "truvativ ISIS external, dual bearing". When i asked about the cranks the guy at the dealer said that if i wanted to swap them out i would have to pick something from the Hussefelt series as Truvativ had som special spline version going on (Howitzer?). Is there anyone that can clarify this? Will any regular ISIS spline cranks fit or do i have to change out the BB/use Hussefelt-series cranks to make it fit?Cheers!The truvativ ISIS cranks are what they say they are, they are ISIS cranks.But the Howitzer BB uses the Truvativ Power Spline (Not ISIS). So if you have the power spline BB you will need some power spline cranks. I think there are some Isoflow cranks and Holzfeller Truvativ cranks that take it. Do a seach for Power spline cranks. Edited October 29, 2009 by totaltrials Quote Link to comment Share on other sites More sharing options...
belga Posted October 30, 2009 Author Report Share Posted October 30, 2009 The truvativ ISIS cranks are what they say they are, they are ISIS cranks.But the Howitzer BB uses the Truvativ Power Spline (Not ISIS). So if you have the power spline BB you will need some power spline cranks. I think there are some Isoflow cranks and Holzfeller Truvativ cranks that take it. Do a seach for Power spline cranks.That both sheds a light on things, and makes me very confused.The specs say ISIS, but the mounted cranks are Truvativs Ruktion cranks which are marked with the howitzer logo and are supposed to be made with the howitzer BB interface only. Maybe i just have to take it apart and have a look for myself. Is there a way to tell the difference just by looking at the splines (my friend google only told me they should be smaller, and i don't know it that's true)? Quote Link to comment Share on other sites More sharing options...
totaltrials Posted October 30, 2009 Report Share Posted October 30, 2009 (edited) That both sheds a light on things, and makes me very confused.The specs say ISIS, but the mounted cranks are Truvativs Ruktion cranks which are marked with the howitzer logo and are supposed to be made with the howitzer BB interface only. Maybe i just have to take it apart and have a look for myself. Is there a way to tell the difference just by looking at the splines (my friend google only told me they should be smaller, and i don't know it that's true)?Right ok. From your description it sounded like the power spline, sorry . The Ruktion cranks need a Howitzer BB. It's very similar to an ISIS but it's not quite the same, apparently. Your best bet is to just get the Howitzer BB. It's heavy duty with large external bearings anyway, so it's a good BB.Make sure you get the correct chain line for it, I don't think they come with axle lengths but chain line sizes instead. You should just measure the distance between the dropouts (135mm probably) half that, then minus the distance from the driveside dropout to the middle cog on the cassette. This should give you approx. the best chain line which you can then match up for your axle length. If you're still not sure, just get your local bike shop to sort it out for you, they'll have to order the correct BB. Edited October 30, 2009 by totaltrials Quote Link to comment Share on other sites More sharing options...
craigjames Posted October 30, 2009 Report Share Posted October 30, 2009 I've just gone and had a look at a howitzer bb i've got in the garage and my spare isis middleburns fit on there perfectly........ Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.