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Post by mayk on Sept 8, 2006 20:04:27 GMT 8
Hi,
What height/frame size would you recommend 170mm or 175mm crank. I'm 5'5" and just realized that I'm using a 175mm crank, I've seen that built bikes in the catalogs that are XS or S in size almost always have 170mm cranks. I'm thinking of changing my crank to 170mm. I've read in some sites that it will improve my cadence and spinning.
Any inputs?
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Post by Dragunov on Sept 8, 2006 20:23:20 GMT 8
Hi, What height/frame size would you recommend 170mm or 175mm crank. I'm 5'5" and just realized that I'm using a 175mm crank, I've seen that built bikes in the catalogs that are XS or S in size almost always have 170mm cranks. I'm thinking of changing my crank to 170mm. I've read in some sites that it will improve my cadence and spinning. Any inputs? i use 170 if im just gonna use the bike for flat roads and trails, 175 has an extra leverage advantage when doing climbs, experiment with it and go with what u are comfortable using |
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Post by Superbad on Sept 8, 2006 20:35:03 GMT 8
actually the crank length depends on your height.
docmayk what kind of cranks do you have?
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Post by king on Sept 8, 2006 20:47:08 GMT 8
you should be ok with 170mm cranks, assuming you can find them. most of the shops here only sell 175mm mtb cranks and 172.5 road cranks. i use 170 myself on both my road and mountain bikes, and i'm 5'8".
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Post by Onie on Sept 8, 2006 20:55:56 GMT 8
175mm for me... long-legged & for better torQue for climbs like what brad Pete mentioned.  |
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Post by Superbad on Sept 8, 2006 22:08:27 GMT 8
mine are 170. want to trade?
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Post by mayk on Sept 9, 2006 12:14:32 GMT 8
What's your crank? I'm have a 2005 LX.
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Post by Superbad on Sept 9, 2006 12:23:47 GMT 8
What's your crank? I'm have a 2005 LX. We have the same! |
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Post by >rocketman> on Sept 9, 2006 13:13:56 GMT 8
crank arm lengthS:
5'5" tall youre Ok with 170 crank arm length.
XC 175 mm for leverage, climbs
4X 175 for leverage, sprint
DHR 165/170 for clearance
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Post by grnhrnt on Sept 9, 2006 16:19:05 GMT 8
hey docmyk and raul,
You guys should trade. imagine the chances of finding each other both willing to trade their cranks?
I use 170 on my road bike but have 175 on my mtb. I thnk it does have to do w/ leverage. I don't think you can "spin" inthe road bike sense as much in trails.
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Post by pjax on Sept 27, 2006 23:21:24 GMT 8
the best way to make sure what cranks you need is to go to toots chua for bike fitting. i believe grnht knows about this. through bike fitting you will be measured up to determine the ideal crank length scientifically. just got bike fitted a while ago
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Post by clutchshooter on Sept 28, 2006 3:37:31 GMT 8
wrenchscience  |
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Post by g.b.b on Sept 28, 2006 3:52:56 GMT 8
i've tried 170 and 175......
i use 170 for my SS..........
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Post by Patrick on Sept 28, 2006 5:25:23 GMT 8
Using diff length of cranks also affects your gear ratio if your using 11T-32T casette you may need to change it to 11T-34T (usually for 2 chainring cranks) to compensate.
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Post by <eVs10nacious< on Sept 28, 2006 7:09:03 GMT 8
try 172.5mm crank for ur height!
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Post by lucban on Sept 28, 2006 7:25:26 GMT 8
175 mm gives more plus because its good for climbing which is the hardest part of MT biking.You can sprint on this crank not as fast as 170 mm but you wont see the difference?  |
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Post by mayk on Sept 28, 2006 8:03:47 GMT 8
the best way to make sure what cranks you need is to go to toots chua for bike fitting. i believe grnht knows about this. through bike fitting you will be measured up to determine the ideal crank length scientifically. just got bike fitted a while ago Who is Toots Chua? Does he/she work in a LBS? |
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Post by Poseur on Nov 24, 2006 3:18:12 GMT 8
Using diff length of cranks also affects your gear ratio if your using 11T-32T casette you may need to change it to 11T-34T (usually for 2 chainring cranks) to compensate. gear ratio is not affected by the length of the crank arms. that's why it's called gear ratio... just the gears. |
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Post by pjax on Dec 13, 2006 22:23:47 GMT 8
Using diff length of cranks also affects your gear ratio if your using 11T-32T casette you may need to change it to 11T-34T (usually for 2 chainring cranks) to compensate. gear ratio is not affected by the length of the crank arms. that's why it's called gear ratio... just the gears. but still, longer crank arms will affect pedalling "leverage". the gear ratio wont change but a longer crank has the effect of a lower gear. |
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rt
Urban Assaulter
Posts: 77
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Post by rt on Dec 14, 2006 17:21:20 GMT 8
I use 175mm on both my road and MTB.
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Post by BrusKO on Dec 14, 2006 22:10:27 GMT 8
I use 170mm for my rig. However, the next cranks I buy would probably be 175mm for (as you say) leverage in climbing.
Wonder how 5 millimeters longer can affect ground clearance? Noticeable kaya?
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Post by shuzzs on Dec 14, 2006 23:01:46 GMT 8
A rider friend is using a 175 mm crank. He said that longer crank (arm) is good for mashers (climbing) while 170 mm crank is good for spinners.
Well, I think it still depends on your height.
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Post by Ben Dover on Dec 15, 2006 9:49:24 GMT 8
i dont know but i believe choosing the right crankarm length should depend on your inseam/leg lenght...i'm currently using 175mm and i want to go back to 170mm.
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Post by BrusKO on Dec 15, 2006 15:14:40 GMT 8
I noticed today how a friend spun. Ganda tingnan- good cadence. When I checked further, he's using 175mm... but he's about 6 feet tall. I can't tell if 175mm will do me good. I'm 5'9. Anyone? BTW, how much weight is added on the 170mm? Sorry kulit ko...
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Post by grnhrnt on Dec 15, 2006 15:18:49 GMT 8
Yup Lito is right. The crank length has to do w/ the inseam length and more (the length of the femur bone). Like i posted earlier, for the road bike i was told to get a 170 mm crank lenght but for mtb the recommended length was 175! go figure. I never asked toots why this was so, becasue I was so distracted about the fact that i had to change my brand new (2 week-old) ultegra cranks because they were 172.5. So does 5mm make a difference? does 2.5 mm? I had to discount the cranks by 20%....
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Post by jingo on Dec 15, 2006 15:33:32 GMT 8
bike fitting at Cycling Zone every wednesday. it recommends what correct framesize, stem length, seatpost height, crank arm length etc. to use. mr. toots chua does the bike fitting for a minimal fee of P1,000. it gives you 3 settings...road bike, time trial bike and cross country mtb. bike fitting schedule is at 10am, 1 and 3pm. it takes at least 2 hours to bike fit. you will need to bring your cycling shorts, cycling shoes and your bike. salamt po.
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weenie
All-Mountain Rider
Weenie the Pooh
Posts: 174
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Post by weenie on Dec 15, 2006 19:02:01 GMT 8
i'm currently using 2 MTBs, one with 175 and another with 170
frankly I couldn't even feel the difference...
but given my height (almost 6ft) I always go for 175
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kaloi
All-Mountain Rider
Posts: 151
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Post by kaloi on Dec 19, 2006 21:45:14 GMT 8
i am 5'6- not a long legged rider, i used to have the 175mm but im now using a 170mm (because of a good price deal). i thought 5mm is so negligible that i wont feel much of a difference. i tried it first at UP before even going to trails, as i ride i felt significant effect in my spinning. my pedalling torque had reduced but it got finer! still i have to test it on trails.. though i expected that it will not be as good climb as the 175mm can give and that i really have to adjust on the gearing. Off we went to reverse afp-maarat (well known for steep technical climbs). much to my surprise - nagkasundo kami!!! hehehe. The secret is lang pala is +1 adjustment on the gearing. There's really a difference in the leverage but it had compensated my riding for the better. im happy with my 170. ..... yet i missed my 175 hehehe |
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Post by Dragunov on Dec 25, 2006 0:21:58 GMT 8
170mm is for humans with short legs ;D ;D ;D,
175mm is for humans with long legs ;D ;D ;D
180mm is for humans with longer legs ;D ;D ;D
185mm...........are you human? ;D ;D ;D
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Post by Patrick on Dec 27, 2006 22:27:22 GMT 8
Using diff length of cranks also affects your gear ratio if your using 11T-32T casette you may need to change it to 11T-34T (usually for 2 chainring cranks) to compensate. gear ratio is not affected by the length of the crank arms. that's why it's called gear ratio... just the gears. Oh yes they do. 2:1 will not feel the same with different length of cranks because they are not the same setup. The shorter the crank the more power you need to drive the same gear ratio. Lesser mechanical advantage. Same with tire diameter. Same gear ratio will not feel the same. You now lost 5 mm of leverage. |
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