New bie question ...Conversion - compact to triple.possible ?
#1
Member
Thread Starter
Join Date: Jun 2011
Posts: 31
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
New bie question ...Conversion - compact to triple.possible ?
I am newbie to road bikes ; I have trek fuel ex 8 (mountain bike)a
nd it has triple crank and overall mechanism helps me a lot duriing steep climbs.
I have new road bike with SRAM Rival group set with compact crank. Since my legs are not that strong; I struggle climbing hills on road bike hence I am wondering if I can make changes to the road bike to get that extra low gear (same as i have on trek fuel ex8) for steep climbs..
What parts and budget I should be looking for ?
I just wanted to get an idea before walk into the lbs..
Thank you all..
nd it has triple crank and overall mechanism helps me a lot duriing steep climbs.
I have new road bike with SRAM Rival group set with compact crank. Since my legs are not that strong; I struggle climbing hills on road bike hence I am wondering if I can make changes to the road bike to get that extra low gear (same as i have on trek fuel ex8) for steep climbs..
What parts and budget I should be looking for ?
I just wanted to get an idea before walk into the lbs..
Thank you all..
Last edited by Desi; 07-18-11 at 08:29 AM. Reason: Typo
#2
Senior Member
Join Date: Oct 2007
Location: West Yorkshire, United Kingdom
Posts: 5,773
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 453 Post(s)
Liked 104 Times
in
87 Posts
Mountain Bikes and Road bike gearing has very little in common when it comes to making it easier to go up hill like you are asking, MTB's (Your Trek) have smaller (26" wheels) Front and rear suspension, and totally different angles (geometry) and a 22/32/42 crank, where your road bike will have sharper angles, no suspension and a 34/50 crank.
What cassette do you have? if a 11-23 then it will be hard to climb with, if a 12-32 it should be very easy. suggest looking at your cassette ratio before going to a triple, which would involve totally new groupset as SRAM doesn't do triples.
Rule #5 also applies here
What cassette do you have? if a 11-23 then it will be hard to climb with, if a 12-32 it should be very easy. suggest looking at your cassette ratio before going to a triple, which would involve totally new groupset as SRAM doesn't do triples.
Rule #5 also applies here
#3
Banned
Many cyclo-camping touring bike set-ups use a MTB compact triple,
44/32/22,
road triple will use 53/39/30 combinations,
"Trekking" type, is similar to what MTB's used in the recent past.
48/38/28..
The mix and match from competing companies will need sorting some..
SRAM-mano.
44/32/22,
road triple will use 53/39/30 combinations,
"Trekking" type, is similar to what MTB's used in the recent past.
48/38/28..
The mix and match from competing companies will need sorting some..
SRAM-mano.
#4
Senior Member
Join Date: Oct 2007
Location: West Yorkshire, United Kingdom
Posts: 5,773
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 453 Post(s)
Liked 104 Times
in
87 Posts
Many cyclo-camping touring bike set-ups use a MTB compact triple,
44/32/22,
road triple will use 53/39/30 combinations,
"Trekking" type, is similar to what MTB's used in the recent past.
48/38/28..
The mix and match from competing companies will need sorting some..
SRAM-mano.
44/32/22,
road triple will use 53/39/30 combinations,
"Trekking" type, is similar to what MTB's used in the recent past.
48/38/28..
The mix and match from competing companies will need sorting some..
SRAM-mano.
SRAM as the 12-32 cassette which is why they haven't release a triple crank as this range covers what the triple did.
#5
Senior Member
Desi, The rear cassette swap is the easiest and least expensive option, even if it requires a different rear derailleur. What is the range of your current cassette?
Brad
Brad
#6
Senior Member
Join Date: Sep 2008
Location: Collegeville, PA
Posts: 1,350
Bikes: Ruckelshaus Randonneur, Specialized Allez (early 90's, steel), Ruckelshaus Path Bomber currently being built
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
Easiest path is the cassette. I don't believe the SRAM front shifter can handle a triple, and the front derailleur cage shape is for the double.
#7
Member
Thread Starter
Join Date: Jun 2011
Posts: 31
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
all I know at this time the road bike has SRAm Rival group set; since i am work at present; will check cassette in the evening when i get home.
Thanks for your help...
Thanks for your help...
#9
Member
Thread Starter
Join Date: Jun 2011
Posts: 31
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
What do I check to see what type of cassette & range it has ? Will it help I I post picture in the evening.... It is a newer bike ( 2010)..Thanks
#10
Senior Member
Brad
Last edited by bradtx; 07-18-11 at 10:24 AM. Reason: sp
#11
Bikaholic
Join Date: Dec 2006
Location: Western, Michigan
Posts: 1,461
Bikes: Trek Fuel 90, Giant OCR, Rans Screamer Tandem
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Simply count the number of teeth on the smallest and largest cogs. You may see the number of teeth stamped in the metal as well. You could also post here what make and model of bike it is and we could look up the specifications assuming that it is stock.
#12
Senior Member
SRAM Apex 11-32 cassette: $69
New 10-speed chain: $40-$70, depending on brand
You can use your current shifters without a problem. With the compact crank, you'll have a pretty low gear ration.
I just built up a bike with an Apex groupset, because I'm old and fat. ;-) I'm really pleased with it so far.
__________________
Knows the weight of my bike to the nearest 10 pounds.
Knows the weight of my bike to the nearest 10 pounds.
#13
Faster but still slow
Join Date: Jun 2006
Location: Jersey
Posts: 5,978
Bikes: Trek 830 circa 1993 and a Fuji WSD Finest 1.0 2006
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 2 Times
in
2 Posts
I did this recently. I got a MTB deore RD with an 11-36 Cassette. Inexpensive compared to a triple conversion and it is plenty low enough for hills even while towing my two kids in a trailer behind me(extra 70 lbs).
#14
Bikaholic
Join Date: Dec 2006
Location: Western, Michigan
Posts: 1,461
Bikes: Trek Fuel 90, Giant OCR, Rans Screamer Tandem
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
This is a good choice but you may need the Apex Derailure to handle the larger gears in the cassette
#15
Senior Member
Join Date: Apr 2010
Location: Mountain View, CA USA and Golden, CO USA
Posts: 6,341
Bikes: 97 Litespeed, 50-39-30x13-26 10 cogs, Campagnolo Ultrashift, retroreflective rims on SON28/PowerTap hubs
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 550 Post(s)
Liked 325 Times
in
226 Posts
I am newbie to road bikes ; I have trek fuel ex 8 (mountain bike)a
nd it has triple crank and overall mechanism helps me a lot duriing steep climbs.
I have new road bike with SRAM Rival group set with compact crank. Since my legs are not that strong; I struggle climbing hills on road bike hence I am wondering if I can make changes to the road bike to get that extra low gear (same as i have on trek fuel ex8) for steep climbs..
What parts and budget I should be looking for ?
nd it has triple crank and overall mechanism helps me a lot duriing steep climbs.
I have new road bike with SRAM Rival group set with compact crank. Since my legs are not that strong; I struggle climbing hills on road bike hence I am wondering if I can make changes to the road bike to get that extra low gear (same as i have on trek fuel ex8) for steep climbs..
What parts and budget I should be looking for ?
All Campagnolo left shifters will run triple front derailleur; best would be a set of NOS 2010 Centaur 10 speed Ultrashift levers. Your LBS probably won't be able to get them (they're discontinued) but Shiny Bikes in the UK still has them for $200 (you don't pay VAT as a US resident).
Use a Campagnolo comp triple front derailleur so you don't run out of pull on the left lever (they went from having 12 clicks of which 7 were used for the triple to 6 of which all get used). About $50 from the UK. 50-100% more from your LBS.
Take your pick of triple front Cranksets. Shimano and Campagnolo shift better than FSA and may or may not cost more (Shimano nameless numbered parts are affordable) - the Campagnolo Comp Triple runs about $120 from the UK. Maybe double that from your LBS.
(UK online retail prices are lower than US wholesale).
You'll also need a longer chain if switch from a 50 big ring to a 53/53.
#16
Senior Member
Unfortunately the OP has SRAM road shifters so he's going to have to replace the derailler, cassette, and chain, so it's not going to be an inexpensive option.
__________________
Knows the weight of my bike to the nearest 10 pounds.
Knows the weight of my bike to the nearest 10 pounds.
#17
Senior Member
Join Date: Apr 2010
Location: Mountain View, CA USA and Golden, CO USA
Posts: 6,341
Bikes: 97 Litespeed, 50-39-30x13-26 10 cogs, Campagnolo Ultrashift, retroreflective rims on SON28/PowerTap hubs
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 550 Post(s)
Liked 325 Times
in
226 Posts
It lets them sell to the recreational market with only one more SKU to build, distributed, and stock compared to the triple approach requiring at least a couple more cranksets, one more front derailleur, and one more left shifter. It's nicer for OEM sales too, allowing bike companies to make fewer models that some people won't buy.
With
50-34 x 11-12-13-15-17-19-21-24-28-32
matching the range of
53-39-28 x 12-13-14-15-16-17-19-21-23-26
the SRAM wide-range double won't be as nice to ride hard on flatter terrain as a triple but will cost a lot less.
Last edited by Drew Eckhardt; 07-18-11 at 02:07 PM.
#18
Senior Member
SRAM has an Apex medium cage derailleur which will mate a 12-32 to a 50-34 compact crankset.
It lets them sell to the recreational market with only one more SKU to build, distributed, and stock compared to the triple approach requiring at least a couple more cranksets, one more front derailleur, one more left shifter, and a lot more bikes which some people won't buy.
With
50-34 x 11-12-13-15-17-19-21-24-28-32
matching the range of
53-39-28 x 12-13-14-15-16-17-19-21-23-26
the SRAM wide-range double won't be as nice to ride hard on flatter terrain as a triple but will cost a lot less.
It lets them sell to the recreational market with only one more SKU to build, distributed, and stock compared to the triple approach requiring at least a couple more cranksets, one more front derailleur, one more left shifter, and a lot more bikes which some people won't buy.
With
50-34 x 11-12-13-15-17-19-21-24-28-32
matching the range of
53-39-28 x 12-13-14-15-16-17-19-21-23-26
the SRAM wide-range double won't be as nice to ride hard on flatter terrain as a triple but will cost a lot less.
__________________
Knows the weight of my bike to the nearest 10 pounds.
Knows the weight of my bike to the nearest 10 pounds.
#19
Member
Thread Starter
Join Date: Jun 2011
Posts: 31
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
#20
Retired dabbler
Join Date: May 2010
Location: Acton, MA (20 miles west of Boston) - GORGEOUS cycling territory!
Posts: 788
Bikes: 2007 Specialized Roubaix Elite Triple - 1st ride = century 9/19/2010 , Ultegra
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 46 Post(s)
Likes: 0
Liked 0 Times
in
0 Posts
Crank - Compact to Triple = new crank + derailleur + shift lever
Gears - SRAM Rival - 11-32 tooth = new cassette
Gears - Road to MTB - w/ Shimano it's a 9-speed rear derailleur + 11-34 or 11-36 cassette (but I don't know SRAM)
--------
Small chainring on Compact = 34, on Triple = 30
So ratio w/ max SRAM cassette with compact = 1 revolution of wheel requires 0.94 (32/34) revolution of the pedals
....with triple = 1 revolution of wheel requires 1.07 (32/30) revolution of the pedals
More revolutions of the pedals per mile mean less effort (and slower speed).
That's 13% easier (I think I have that right)
Good luck
PS - Hills that kill you now will seem routine next year if you ride a lot.
Gears - SRAM Rival - 11-32 tooth = new cassette
Gears - Road to MTB - w/ Shimano it's a 9-speed rear derailleur + 11-34 or 11-36 cassette (but I don't know SRAM)
--------
Small chainring on Compact = 34, on Triple = 30
So ratio w/ max SRAM cassette with compact = 1 revolution of wheel requires 0.94 (32/34) revolution of the pedals
....with triple = 1 revolution of wheel requires 1.07 (32/30) revolution of the pedals
More revolutions of the pedals per mile mean less effort (and slower speed).
That's 13% easier (I think I have that right)
Good luck
PS - Hills that kill you now will seem routine next year if you ride a lot.
#21
Senior Member
Join Date: Apr 2010
Location: Mountain View, CA USA and Golden, CO USA
Posts: 6,341
Bikes: 97 Litespeed, 50-39-30x13-26 10 cogs, Campagnolo Ultrashift, retroreflective rims on SON28/PowerTap hubs
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 550 Post(s)
Liked 325 Times
in
226 Posts
Small chainring on Compact = 34, on Triple = 30
So ratio w/ max SRAM cassette with compact = 1 revolution of wheel requires 0.94 (32/34) revolution of the pedals
....with triple = 1 revolution of wheel requires 1.07 (32/30) revolution of the pedals
More revolutions of the pedals per mile mean less effort (and slower speed).
That's 13% easier (I think I have that right)
So ratio w/ max SRAM cassette with compact = 1 revolution of wheel requires 0.94 (32/34) revolution of the pedals
....with triple = 1 revolution of wheel requires 1.07 (32/30) revolution of the pedals
More revolutions of the pedals per mile mean less effort (and slower speed).
That's 13% easier (I think I have that right)
Road triples have a 74mm BCD which will take a 24 ring. Although 53-39-24 (or even 50-39-24) exceeds the manufacturers' stated range on road front derailleurs plenty of people are satisfied with the performance, especially with a chain catcher. 46-36-24 would be in the capacity spec, shift a bit better, and still provide a big enough gear with an 11 or 12 starting cog.
Comparing non-stock chain rings in both cases, compact doubles have a 110mm BCD which will take a 33 ring.
24/33 = 27% easier if you really need it.
A 50.4 BCD randonneuring double (Grand Cru makes one with retro style and reasonable price tag) or 110/74 super compact (the inner two rings of a triple mounted on a slightly longer bottom bracket) with 46/30 rings is another option where a compact isn't enough.
Last edited by Drew Eckhardt; 07-19-11 at 12:32 PM.
#22
Senior Member
Thanks. The 11-32 cassette will give you about 7-8 gear inches advantage (~18%), which should make a noticeable difference. More than likely you will have to change the rear derailleur to cope with the larger gear spread. At a bike shop the cost would be for the cassette, the RD, labor and should take about 30 minutes to complete. Keep your old parts.
Brad
Brad
Thread
Thread Starter
Forum
Replies
Last Post
mthayer
Long Distance Competition/Ultracycling, Randonneuring and Endurance Cycling
2
03-30-11 09:47 PM