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Gears gears gear..what to choose?
Hello all..
I am new to road cycling. I road a few thousand miles last year. I got new bike about July last year. I did not know much about road bikes whe I purchased it and I think the gearing my not be ther best for me I am sure gearing is like favorite colors. Everybody has one and the are mostly different I mostly wanted to talk about compact cranksets and what my riding wil be like... I have a 13-29 now. Med cage derail. Standard size Front... Ok....It is an OK setup....not great but OK... The top two rear gears hit the top cog of the derail when I am in them SO...here is my plan and here is the situation... I am getting a 12-25...I will ride that this year until July. I am goin to France to ride a tour at Alp De Huez. I have been informed that ther in no flat option. : I am a so so rider....not a racer but I like to ride hard and think I a fast..... : When I go to France I plan on getting a compact set of cranks. 50-34 an keeping my 12-25.... http://www.vsstech.net/biff/bike-gears.ht Here is a HTML file of my gear calc' I want to know what you guys think.....and I don't want to know abou what a geek you think I am or that I have too much free time on m hands.....I have been bitten by the bug of road cycling. I like it. : Here are a few other pic's of me and my bike. http://www.vsstech.net/biff/MS150.JP http://www.vsstech.net/biff/my_ride.jp http://www.vsstech.net/biff/hooters.jp PS anyone going to be at the Jalapeno Hundred this weekend http://www.harlingen.com/jalapeno.ht Me and my girlfriend will be. Let me know and we can say hi and mayb ride a few miles.... Bif - |
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#2
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Gears gears gear..what to choose?
bstephens wrote:
Hello all... I am new to road cycling. I road a few thousand miles last year. I got a new bike about July last year. I did not know much about road bikes when I purchased it and I think the gearing my not be ther best for me. I am sure gearing is like favorite colors. Everybody has one and they are mostly different. I mostly wanted to talk about compact cranksets and what my riding will be like.... I have a 13-29 now. Med cage derail. Standard size Front.... Ok....It is an OK setup....not great but OK.... The top two rear gears hit the top cog of the derail when I am in them. SO...here is my plan and here is the situation.... I am getting a 12-25...I will ride that this year until July. I am going to France to ride a tour at Alp De Huez. I have been informed that there in no flat option. I am a so so rider....not a racer but I like to ride hard and think I am fast..... When I go to France I plan on getting a compact set of cranks. 50-34 and keeping my 12-25..... http://www.vsstech.net/biff/bike-gears.htm Here is a HTML file of my gear calc's I want to know what you guys think.....and I don't want to know about what a geek you think I am or that I have too much free time on my hands.....I have been bitten by the bug of road cycling. I like it. Here are a few other pic's of me and my bike.. http://www.vsstech.net/biff/MS150.JPG http://www.vsstech.net/biff/my_ride.jpg http://www.vsstech.net/biff/hooters.jpg PS anyone going to be at the Jalapeno Hundred this weekend? http://www.harlingen.com/jalapeno.htm Me and my girlfriend will be. Let me know and we can say hi and maybe ride a few miles..... Biff Deraileur jockey wheels hitting 29T sprockets is indicative of deraileur adjustment problem, not a reason to change ratios. The trip t France might be a reason to change, but with no indication of where yo are riding now and handling the hills, load you’ll be touring with there is insufficient info on the ratio changes For the derailleur, try this http://www.sheldonbrown.com/derailer-adjustment.htm See adjustment 4 - |
#3
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Gears gears gear..what to choose?
bstephens wrote:
Thank you for the quick reply..... I am in Oklahoma....will ride over Oklahoma, Arkansas, Texas and Kansas. Pretty flat but with some rolling hills. The lack of altitude breathing and mountain ride will effect me I am sure. Touring is a strong word and out of place really (sorry about that) We will be leaving from one location every day. We will be on an Alp though so the riding will be hard I am sure..... The second part: I have tried and tried......asked many times and mentioned each time I was NEAR a bike shop about the problem. My guess is that the bike.....a TCR Giant and not really made for such a big cassette. It would seem that the derail hanger would need to be just a bit longer. I have asked about this and there is not a longer one available. It has made the noise since the start of the bike and I really (I promise) have had more than a few bike shops look at it...they all say they can fix it and it is still there when I get it back... Hope this helps....... Biff The proposed ratio change has essentially the same bottom end as you current setup. That’s a lot of trouble to only save a few ounces i sprocket and chainring weight, particularly since the weight saving would be offset by the lower efficiency of the smaller sprockets A longer cage might give you more clearance on the big sprockets, bu since your angle of inclination is wrong, the resulting change woul leave your derailleur excessively far away from small sprockets fo smooth shifting. It would be a lot less effort to adjust the inclinatio adjust screw and have the derailleur work optimally on the large an small sprockets than replacing the arm and have the derailleur shif less smoothly For the France trip- If in doubt, I’d want to have more climbin ability, so a lower gear ratio is in order. Changing front chainring often leads to unexpected headaches with the front derailleur-at minimu you need some adjustment and/or positioning changes, might need a ne front derailleur Take a look at this thread: http://www.cyclingforums.com/t88848.htm Or you might go with an 11/34 or 12/34 Megarange cassette. Better t have too low a bottom than too high. That would need a rear derailleu change to a long cage ratio. Mountain bike long cage derailleurs easil shift on that cassette. A long cage derailleur has more chainwra takein/takeout than short or medium cage derailleur at the expense o shifting quality - |
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Gears gears gear..what to choose?
On Tue, 17 Feb 2004 05:34:58 +0000, bstephens wrote:
I am getting a 12-25...I will ride that this year until July. I am going to France to ride a tour at Alp De Huez. I have been informed that there in no flat option. I am a so so rider....not a racer but I like to ride hard and think I am fast..... When I go to France I plan on getting a compact set of cranks. 50-34 and keeping my 12-25..... Why wait? That 12-25 with a 50/34 will give you much better (IMO) gearing than the 12-25 with the 52/39. You lose a minimal amount by dropping from the 52 to a 50, and gain utility going to the 34. Besides, you should not try a long tour with untested equipment. Get the adjustments dialed in over the Spring. PS anyone going to be at the Jalapeno Hundred this weekend? http://www.harlingen.com/jalapeno.htm Wish I were. Looks good. Y'all have fun, now. -- David L. Johnson __o | If all economists were laid end to end, they would not reach a _`\(,_ | conclusion. -- George Bernard Shaw (_)/ (_) | |
#5
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Gears gears gear..what to choose?
As already mentioned, your rear derailleur is not in adjustment if it
is hitting the cogs. Try turning the B screw in more, or all the way in. I am pretty sure turning the B screw in moves the derailleur pulleys farther away from the cogs. The B screw is the small screw on the back of the rear derailleur near the frame's derailleur hanger. As for your gearing, you currently have 39x29 as your low. 35.64 gear inches. (Formula is 39 divided by 29 times wheel diameter of 26.5 inches.) Assuming you have the 99.99% standard 39 tooth inner chainring. You propose changing your gearing to a low of 34x25. 36.04 gear inches. And you are going to go ride up Alpe d'Huez. More power to you. Your high gear with 53x13 is 108.04 gear inches. Your proposed new high gear of 50x12 will be 110.42 gear inches. I have no doubt you will be faster down the mountains in your higher gear. I'm curious how you concluded your current Campagnolo gear setup is not great but OK, while your new gear setup will presumably be great? stephens wrote in message ... Hello all... I am new to road cycling. I road a few thousand miles last year. I got a new bike about July last year. I did not know much about road bikes when I purchased it and I think the gearing my not be ther best for me. I am sure gearing is like favorite colors. Everybody has one and they are mostly different. I mostly wanted to talk about compact cranksets and what my riding will be like.... I have a 13-29 now. Med cage derail. Standard size Front.... Ok....It is an OK setup....not great but OK.... The top two rear gears hit the top cog of the derail when I am in them. SO...here is my plan and here is the situation.... I am getting a 12-25...I will ride that this year until July. I am going to France to ride a tour at Alp De Huez. I have been informed that there in no flat option. I am a so so rider....not a racer but I like to ride hard and think I am fast..... When I go to France I plan on getting a compact set of cranks. 50-34 and keeping my 12-25..... http://www.vsstech.net/biff/bike-gears.htm Here is a HTML file of my gear calc's I want to know what you guys think.....and I don't want to know about what a geek you think I am or that I have too much free time on my hands.....I have been bitten by the bug of road cycling. I like it. Here are a few other pic's of me and my bike.. http://www.vsstech.net/biff/MS150.JPG http://www.vsstech.net/biff/my_ride.jpg http://www.vsstech.net/biff/hooters.jpg PS anyone going to be at the Jalapeno Hundred this weekend? http://www.harlingen.com/jalapeno.htm Me and my girlfriend will be. Let me know and we can say hi and maybe ride a few miles..... Biff -- |
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Gears gears gear..what to choose?
Or you might go with an 11/34 or 12/34 Megarange cassette. Better to
have too low a bottom than too high. That would need a rear derailleur change to a long cage ratio. Mountain bike long cage derailleurs easily shift on that cassette. A long cage derailleur has more chainwrap takein/takeout than short or medium cage derailleur at the expense of shifting quality. He has Campagnolo if his 13-29 cassette statement was correct. With Campagnolo 13-29 is the Megarange cassette. And 13-29 is only available in 10 speed, so he cannot use a Shimano 9 speed cassette as a substitute for a Campagnolo 9 speed wheel, as some folks do. If he wants lower gears, he has to get lower chainrings on his crank. Triple could easily do that by just changing the crank, bottom bracket, and maybe front derailleur. $180 for Centaur 9 speed from Nashbar which will work just fine on a 10 speed bike because the crank, bottom bracket, and front deraillleur don't really care if its 9 or 10 speed. |
#7
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Gears gears gear..what to choose?
On Tue, 17 Feb 2004 16:03:14 -0800, Russell Seaton wrote:
He has Campagnolo if his 13-29 cassette statement was correct. With Campagnolo 13-29 is the Megarange cassette. And 13-29 is only available in 10 speed, so he cannot use a Shimano 9 speed cassette as a substitute for a Campagnolo 9 speed wheel, as some folks do. If he wants lower gears, he has to get lower chainrings on his crank. Well, as was pointed out, he is simultaneously changing the cranks to 50/34 and getting a tighter cassette, a 12-25. He does not accomplish a whole lot that way, except to get slightly smaller gaps. However, he could use the 13-29 and get somewhat lower gears. Triple could easily do that by just changing the crank, bottom bracket, and maybe front derailleur. Rear derailleur, too, since he would need a long cage. -- David L. Johnson __o | If all economists were laid end to end, they would not reach a _`\(,_ | conclusion. -- George Bernard Shaw (_)/ (_) | |
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Gears gears gear..what to choose?
Russell Seaton wrote:
Or you might go with an 11/34 or 12/34 Megarange cassette. Better to have too low a bottom than too high. That would need a rear derailleur change to a long cage ratio. Mountain bike long cage derailleurs easily shift on that cassette. A long cage derailleur has more chainwrap takein/takeout than short or medium cage derailleur at the expense of shifting quality. He has Campagnolo if his 13-29 cassette statement was correct. With Campagnolo 13-29 is the Megarange cassette. And 13-29 is only available in 10 speed, so he cannot use a Shimano 9 speed cassette as a substitute for a Campagnolo 9 speed wheel, as some folks do. If he wants lower gears, he has to get lower chainrings on his crank. Triple could easily do that by just changing the crank, bottom bracket, and maybe front derailleur. $180 for Centaur 9 speed from Nashbar which will work just fine on a 10 speed bike because the crank, bottom bracket, and front deraillleur don't really care if its 9 or 10 speed. That is correct, it is a Record setup...sorr for the oversite.. B -- |
#9
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Gears gears gear..what to choose?
Triple could easily do that by just changing
the crank, bottom bracket, and maybe front derailleur. Rear derailleur, too, since he would need a long cage. He has a Campagnolo medium cage rear derailleur already according to his statement. A medium cage rear derailleur will work just fine with a triple and a 29 rear cog. He does not need the slightly longer long cage rear derailleur. Unless he just wants to spend money for a new rear derailleur. |
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