Gearing
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From: WW on 9 Jul 2010 13:03 Have a Yamaha TW 200 for trails. Has a 50 tooth rear sprocket. Bought a 55 tooth sprocket. Not installed yet. Would this give a 10% boost in RPM at a given road speed? Doing this to get lower gearing as at my age now (83) would like to go slower on rough rocky trails. Started riding in 1949 and had much more confidence and less good sense on how I rode. WW
From: XR650L_Dave on 9 Jul 2010 13:39 On Jul 9, 1:03 pm, "WW" <c...(a)nospambresnan.net> wrote: > Have a Yamaha TW 200 for trails. Has a 50 tooth rear sprocket. Bought a 55 > tooth sprocket. Not installed yet. Would this give a 10% boost in RPM at a > given road speed? Doing this to get lower gearing as at my age now (83) > would like to go slower on rough rocky trails. Started riding in 1949 and > had much more confidence and less good sense on how I rode. WW Depends on what the front sprocket is. Assuming 14 teeth on the front 50/14 = 3.57 55/14 = 3.93 (3.57-3.93)/3.57 = -0.101, which is 10.1%. This means the top speed in any gear will be 10% lower at redline, much more noticeable in the higher gears. I geared my 15-45 XR650L down to 14-48 (at time 13:48) and it really helped in the rocky stuff. Dave
From: Tiago on 9 Jul 2010 14:41 On Jul 9, 2:03 pm, "WW" <c...(a)nospambresnan.net> wrote: > Have a Yamaha TW 200 for trails. Has a 50 tooth rear sprocket. Bought a 55 > tooth sprocket. Not installed yet. Would this give a 10% boost in RPM at a > given road speed? Doing this to get lower gearing as at my age now (83) > would like to go slower on rough rocky trails. Started riding in 1949 and > had much more confidence and less good sense on how I rode. WW Hi Warren! Be aware of where lowering gear too much will make the bike prone to flip when climbing hills. In my XR 250, it's almost impossible to flip with the stock 38 or even the 40 tooth optional rear sprocket (my bike is a dual sport, so the street oriented long gearing). But I like to use a 48 tooth to improve low end and make it easier to ride slowly on mud or tight single track but I have to be extra carefully on a first gear hill climb... And ultra extra carefully on a second gear hillclimb that begs a first halfway up... Usually, if not careful with throttle, it will either flip over or stall. Both are bad... Low power bikes have this things, it's not like when you have a 50hp bike that let you climb slow and with the engine in low rpm, on little bikes like mine we have to rev it, be it with the 38T or with the 48T... Given the low cost of a sprocket and assuming you could either change it or have changed easily, I'd go for the 55 and test it. If it's too bad, just change it back to 50T... -- T
From: john on 9 Jul 2010 20:05 that should help the grunt power.. it will yield ~ 10% more rpm for a given speed. i have always liked the granny gear setup for putting about in the woods so i don't have to feather the clutch. eventually I'll bite the bullet and get a auto clutch in a full sized bike for those lazy day type rides i like to do. what would be the cats pajamas would be an auto clutch with an override so that when you pull the left clutch lever it would work the clutch and as you near the bar engage the rear brake. this would help for those situations when you have your right foot on the ground and you would like the rear brake on <grin> 1949... wow you pioneered riding with marginal gear... i would enjoy offroading a vintage Harley/Indian but i would defiantly bring friends to help me lug it over stuff or help me out of a mud patch. john <young whippersnapper> "WW" <ccco(a)nospambresnan.net> wrote in message news:6dSdnXpuvK3yy6rRnZ2dnUVZ_g2dnZ2d(a)bresnan.com... > Have a Yamaha TW 200 for trails. Has a 50 tooth rear sprocket. Bought a 55 > tooth sprocket. Not installed yet. Would this give a 10% boost in RPM at a > given road speed? Doing this to get lower gearing as at my age now (83) > would like to go slower on rough rocky trails. Started riding in 1949 and > had much more confidence and less good sense on how I rode. WW >
From: WW on 9 Jul 2010 21:11
"XR650L_Dave" <spamTHISbrp(a)yahoo.com> wrote in message news:89fd7b69-7aa6-48c1-a79f-60ece77313dc(a)u26g2000yqu.googlegroups.com... On Jul 9, 1:03 pm, "WW" <c...(a)nospambresnan.net> wrote: > Have a Yamaha TW 200 for trails. Has a 50 tooth rear sprocket. Bought a 55 > tooth sprocket. Not installed yet. Would this give a 10% boost in RPM at a > given road speed? Doing this to get lower gearing as at my age now (83) > would like to go slower on rough rocky trails. Started riding in 1949 and > had much more confidence and less good sense on how I rode. WW Depends on what the front sprocket is. Assuming 14 teeth on the front 50/14 = 3.57 55/14 = 3.93 (3.57-3.93)/3.57 = -0.101, which is 10.1%. This means the top speed in any gear will be 10% lower at redline, much more noticeable in the higher gears. I geared my 15-45 XR650L down to 14-48 (at time 13:48) and it really helped in the rocky stuff. Dave Thanks, 14 on front. No longer street ride, too many big 4 wheel things out there trying to get you. WW |