- News
- Reviews
- Bikes
- Accessories
- Accessories - misc
- Computer mounts
- Bags
- Bar ends
- Bike bags & cases
- Bottle cages
- Bottles
- Cameras
- Car racks
- Child seats
- Computers
- Glasses
- GPS units
- Helmets
- Lights - front
- Lights - rear
- Lights - sets
- Locks
- Mirrors
- Mudguards
- Racks
- Pumps & CO2 inflators
- Puncture kits
- Reflectives
- Smart watches
- Stands and racks
- Trailers
- Clothing
- Components
- Bar tape & grips
- Bottom brackets
- Brake & gear cables
- Brake & STI levers
- Brake pads & spares
- Brakes
- Cassettes & freewheels
- Chains
- Chainsets & chainrings
- Derailleurs - front
- Derailleurs - rear
- Forks
- Gear levers & shifters
- Groupsets
- Handlebars & extensions
- Headsets
- Hubs
- Inner tubes
- Pedals
- Quick releases & skewers
- Saddles
- Seatposts
- Stems
- Wheels
- Tyres
- Health, fitness and nutrition
- Tools and workshop
- Miscellaneous
- Buyers Guides
- Features
- Forum
- Recommends
- Podcast
forum
Crank size/Bottom Bracket
I have a Carrera Virtuoso which i am rebuilding. The crank i had on was a 175mm 42/52. I know my arm length needs to remain the same but does the crank have to remain 42/52 or could i use a 39/53? Also the existing bottom bracket is a square tapered type. can i remove and change to a hollowtech or shimano ultegra octolink? Thanks Mark.
If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.
Latest Forum Topics
Latest Comments
- Rendel Harris 2 min 15 sec ago
Indeed, I was drawing from personal experience – I don't use it that often but it's such a nice bit of infrastructure that I sometimes go out of my...
- paulgardener@gmail.com 6 min 20 sec ago
Except socialism doesn't work like that in real life. It's the capitals countries that try to look after those in need, and the average person's...
- Patrick9-32 21 min 20 sec ago
2020/2021: Bike companies place large orders to attempt to fill pandemic orders which go unfulfilled due to massive lead times. Leaving many bike...
- David9694 42 min 1 sec ago
'I racked up thousands in Ulez fines - I misread the rules and my dog ate the letters'...
- KDee 1 hour 3 min ago
It's the mass that's the issue. Two people on a petrol powered scooter can really mess up a cyclist. Also the fact so many of the petrol scooters...
- james-o 1 hour 13 min ago
"if we’ve got to fly there we’re not going" *applause from over here*
- KDee 1 hour 14 min ago
"Strumpjumper"...sounds like a euphemism for something else 🤔
- andystow 1 hour 30 min ago
The new RH tubes claim to solve that issue, but price and availability is a problem. I tried to get some to try out, but they went out of stock on...
- brooksby 1 hour 55 min ago
Cough - cough - Clevedon seafront! - cough cough
- Secret_squirrel 5 hours 25 min ago
Those calipers arent the prettiest. Makes them look like Post-mount.
Add new comment
1 comments
Yes you can replace those cranks with modern equipment, and a new BB, with the gearing you want.
Whether you can install a 39t chainring on the existing right crank arm depends on the bolt circle diameter: it would need to be 135mm or smaller to support that size ring. Some older cranks use a 144mm BCD and you cannot fit a 39t ring on them.
http://www.sheldonbrown.com/cribsheet-bcd.html
I am not familiar with your bike but there is a good chance it may have an Italian threaded bottom bracket. Clarify that before buying a new BB.
Posting a photo of your crankset might produce more accurate advice.