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TOPIC: Gear Ratios Forum Tools Post New Topic Show latest posts Rules

#46718 stanag (User) Senior Boarder Posts: 362 Gear Ratios 4 Years, 7 Months ago   Hello All, Being a newby to Roadstar riding and not having a tach on the Roadstar, I am having a hard time judging the rpm's when I am riding. I found a formula that I think will help me put everything in perspective. http://www.jpcycles.com/Tech/Ref/TopSpeed.aspx I am having problems with the gear ratio. The instructions say (Primary X Secondary) What gear am I in? I was thinking of making a spreadsheet that will cover speeds from 0-100 MPH and all gears (1st, 2nd, etc.) Any gurus out there? Stan   Logged       The administrator has disabled public write access. #46748 Greysnake (User) I'm so far behind I think I'm first. Platinum Boarder Posts: 7907 Re:Gear Ratios 4 Years, 7 Months ago   I just shift by the seat of the pants and sound of the engine. It don't hurt to hit the rev limiter once in awhile. I'll give you a bump and see if some one else can help   Logged     06 Midnight Silverado *nothing shines like a star*   The administrator has disabled public write access. #46774 stanag (User) Senior Boarder Posts: 362 Re:Gear Ratios 4 Years, 7 Months ago   Greysnake, I shift when it sounds and feels good. I would like to know approx. what RPM the engine is turning by the sound. At what RPM's is considered to be lugging the engine? I seem to hit the rev limiter at about 82 mph in third gear. What is my rpm's when this happens. Mostly curiosity I guess. Stan   Logged       The administrator has disabled public write access. #46793 Greysnake (User) I'm so far behind I think I'm first. Platinum Boarder Posts: 7907 Re:Gear Ratios 4 Years, 7 Months ago   Stanag, I'm not a good student on math so I am sure there is someone on here that can figure that out or may already know. The stock limiter tops out at about 4800 and with a speedstar module it bumps to 5500rpm. Wish I could have been more help.   Logged     06 Midnight Silverado *nothing shines like a star*   The administrator has disabled public write access. #46805 DocShadow (Admin) Hmmmm .... send beer Admin Posts: 17615 Re:Gear Ratios 4 Years, 7 Months ago   stanag wrote: I seem to hit the rev limiter at about 82 mph in third gear. What is my rpm's when this happens. Mostly curiosity I guess. You will hit the rev limiter at the same rpm point no matter what gear you are in but obviously at a different speed for each gear. The rpm at which you hit it will depend on which igniter you have. As a comparison .... I hit 62 in 2nd with the limiter at 5000 rpm. Doc   Logged     My Bike Website   The administrator has disabled public write access. #46838 stanag (User) Senior Boarder Posts: 362 Re:Gear Ratios 4 Years, 7 Months ago   Thanks for the help, but when I substitute 4800 for the RPM's into the formula. The equation says that I am doing 98 MPH, my speedo says that I am doing 80. Maybe I expressed myself wrong. I seem to do that a lot as I get older My question is the (total gear ratio = ?) Thanks for the intrest Stan   Logged       The administrator has disabled public write access. #46847 DocShadow (Admin) Hmmmm .... send beer Admin Posts: 17615 Re:Gear Ratios 4 Years, 7 Months ago   The constant (168) is most likely screwing you up. The formula is probably for a specific bike. Doc   Logged     My Bike Website   The administrator has disabled public write access. #46909 Flashback (Moderator) Just the facts, Ma'am.. Moderator Posts: 9221 Re:Gear Ratios 4 Years, 7 Months ago   DocShadow wrote: The constant (168) is most likely screwing you up. The formula is probably for a specific bike. Doc Yep I like it,,, They say let's define a few things here.... but never do they say were the 168 comes from...??? are we supposed to know??? I'm pretty dumb so I think you need to tell me...   Logged       The administrator has disabled public write access. #46969 stanag (User) Senior Boarder Posts: 362 Re:Gear Ratios 4 Years, 7 Months ago   Hello all, I believe that I have found what I am looking for. This site has calculators for everything. The one that I am interested in is (RPM's to MPH). I will make up a spreadsheet and submit it for approval, if anyone is interested. The spreadsheet will have MPH from 0-100 in 5 MPH incriments with corresponding RPM's. I will use the specs. of an 07 Silverado. The site that I am using is http://www.bgsoflex.com/auto.html Thanks for all the feedback. Stan   Logged       The administrator has disabled public write access. #46977 Radar (User) Fresh Boarder Posts: 67 Re:Gear Ratios 4 Years, 7 Months ago   Nice research Stan, I looked up each stock gear ratio on my '06 Midnite. Now maybe I can calculate my RPM's tool Thanks Tom   Logged     '06 R* Silverado Midnight.   The administrator has disabled public write access.

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