Joe, I'll post a pic tomorrow. I don't get MLK off. I assure you its a 4 bolt crank. On Jan 18, 2016 1:14 PM, "Joe Bernard" <joerem...@gmail.com> wrote:
> 4-bolt mtb cranks are 104 and 64, and I don't remember ever seeing a Cook > Bros 4-bolt crank. Can you post a pic of it? We should be able to make a > good guess about what rings you need by looking at it. > > On Monday, January 18, 2016 at 12:50:32 PM UTC-8, hsmitham wrote: >> >> If I use this chart my BCD isn't even there? >> >> >> https://www.bikeman.com/bicycle-repair-tech-info/bikeman-tech-info/1628-chainring-bcd >> >> ~Hugh >> >> “Life is like riding a bicycle. To keep your balance, you must keep >> moving.” ― Albert Einstein >> >> http://velocipeedemusings.com/ >> >> >> >> On Mon, Jan 18, 2016 at 12:41 PM, Bill Lindsay <tape...@gmail.com> wrote: >> >>> Hugh >>> >>> There's a conflict in your measurement procedure, or I'm confused, or >>> both. >>> >>> You say your chainrings all are 4-bolt. That is to say, each chainring >>> is held to the spider with four chainring bolts. Is this right? If so, >>> you measure the BCD by measuring OPPOSITE bolts, not adjacent bolts. If >>> it's 94mm BCD, it will measure 94mm. >>> >>> You say you used the linked chart, but that linked chart is exclusively >>> for 5-bolt rings. 5-bolt rings have no opposite bolt to measure, so you >>> measure the adjacent one and look it up on the chart. >>> >>> So, if you really have 5-bolt rings, then you did the right measurement >>> and you came up with the right BCDs. Rings in the $20 range are findable >>> for that BCD, and are all decent. >>> >>> But, if you really have 4-bolt rings and really measured the adjacent >>> bolts at 34mm and 55mm respectively, then you don't have 58 and 94mm BCDs >>> respectively. >>> Bill Lindsay >>> El Cerrito, CA >>> >>> >>> On Monday, January 18, 2016 at 9:53:00 AM UTC-8, hsmitham wrote: >>>> >>>> Hello Rivendellians, >>>> >>>> I have a 1995 Salsa Ala Carte and I'd like to rehab it with a new drive >>>> and cockpit. It has the original Salsa chromoly stem 130mm and have >>>> considered throwing on a Ritchey 30º rise 80mm stem & straight MTB bar for >>>> more comfort. The current setup I'm pretty stretched out.The old rapid fire >>>> shifters just don't work, I've tried lot's of things to get the shifter >>>> working (advice from LBS) but it seems easier to just buy new one's. >>>> >>>> The drive is 8 speed and has a Cook Bros Crank *(they went out of >>>> business in the early 2000's) which has a 4 bolt spider. I measured the >>>> inner bolts distance between adjacent bolts and determined it was a 58mm >>>> BCD ring, I also measured the outside bolts between adjacent bolts and >>>> figure it's a 94mm BCD ring. I used this chart which seemed the only one >>>> that had my measurements, 34mm & 55mm respectively. It seems MTB's with all >>>> the new tech have left these BCD's behind. >>>> >>>> >>>> http://www.bikeforums.net/classic-vintage/704206-chainring-bcd-chart.html >>>> >>>> I went to the Peter White page and found this page >>>> http://www.peterwhitecycles.com/chainrings.asp >>>> >>>> The TA Carmina rings seem like the right ones? But man are they >>>> expensive! >>>> >>>> Is the bike worth keeping it somewhat period/vintage? Have I measured >>>> this correctly? Are there other ring manufacturers making these ring sizes >>>> and importantly less expensive. I've seen Vuelta and Real rings but just >>>> don't know whether their quality rings? >>>> >>>> I could just purchase a SLX 10 speed group for $230 and be done with >>>> it. >>>> >>>> *I heard Cook Bros came back in 2010 but with limited offerings but my >>>> search has been fruitless in terms of info regarding BCD ring sizes. >>>> >>>> So thanks in advance for any wisdom the group can dispense. >>>> >>>> ~Hugh >>>> Los Angeles, CA >>>> >>>> >>>> >>>> >>>> >>> -- >>> You received this message because you are subscribed to a topic in the >>> Google Groups "RBW Owners Bunch" group. >>> To unsubscribe from this topic, visit >>> https://groups.google.com/d/topic/rbw-owners-bunch/y1ONSgYZx54/unsubscribe >>> . >>> To unsubscribe from this group and all its topics, send an email to >>> rbw-owners-bun...@googlegroups.com. >>> To post to this group, send email to rbw-owne...@googlegroups.com. >>> Visit this group at https://groups.google.com/group/rbw-owners-bunch. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> -- > You received this message because you are subscribed to a topic in the > Google Groups "RBW Owners Bunch" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/rbw-owners-bunch/y1ONSgYZx54/unsubscribe > . > To unsubscribe from this group and all its topics, send an email to > rbw-owners-bunch+unsubscr...@googlegroups.com. > To post to this group, send email to rbw-owners-bunch@googlegroups.com. > Visit this group at https://groups.google.com/group/rbw-owners-bunch. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. 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