- 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
- Tubeless valves
- Buyers Guides
- Features
- Forum
- Recommends
- Podcast
forum
How to run Shimano cranks on Specialized Tarmac 2017
I have a Specialized Tarmac Sport 2017 with Praxis M30 bottom brackets. These I think are BSA threaded on both sides, 30mm and 28mm.
I mistakenly bought Praxis BB30 to Shimano adapter 24mm, which is threaded on one side and push fit on the other!
Which adapter/bottom bracket will I need to run Shimano Ultegra r8000 cranks?
Cheers
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
- Mr Blackbird 1 hour 18 min ago
I suspect you are right. But no harm in hoping.
- Jack Sexty 1 hour 35 min ago
Apologies for the oversight there, it's been corrected. Obviously it should have said 97ft🤦♂️
- festival 1 hour 52 min ago
The more this Nash gezzer opens his mouth the worse he comes across. The mans passion for green issues clouds his judgement on common decency!
- a1white 3 hours 24 min ago
Simon Nash needs to just stick to making the produts and seriously step back from social media and all the marketing. He's an absolute liability to...
- Jitensha Oni 3 hours 37 min ago
Because drivers often find it hard too and nobody’s perfect (indeed a few are bad on purpose)? It’s not really fair to expect people cycling to...
- wtjs 3 hours 56 min ago
Even I would say 'report horse ramming to the police ' because just ignoring that report is viewed as less acceptable than if it was a cyclist -...
- chrisonabike 5 hours 26 min ago
I wasn't a bike geek or "serious" rider then (not now...) - my ride was a non-suspended 26" wheel "mountain bike" with V-brakes and piano key...
- mdavidford 5 hours 35 min ago
And, bonus, you can get rid of feed zones - just make them carry all their supplies in the basket.
- IanMK 6 hours 5 min ago
Indistinguishable? I overtook a legal e-bike last week. I am a member of the public and I managed to distinguish it from an illegal e-motorbike...
- Condor Andy 7 hours 52 min ago
I tried to make a thread announcing a league code for Velogames, but it seems to have been banished to the aether. The code is 620099424
Add new comment
3 comments
I'd suggest you need a standard bottom bracket if it is stating that the current BB is english threaded.
I bought a new Allez for winter this year and was surprised that the Praxis 30mm axle was being held by a Praxiz 30mm screwed bottom bracket, but that bottom bracket was indeed standard english threaded.
Awesome times.
Thanks for your reply.
It's threaded on both sides.
https://praxiscycles.com/product/m30-english-threaded/
This is the BB currently installed. Both sides are threaded.
Just want to double check since the shimano-conversion in your second link is not the right adapter. The first link "standard Praxis BB30" looks similar sized to shimano bottom brackets which are natively 24mm.
Here's the bike, it only says "Threaded BB" :
https://www.specialized.com/us/en/tarmac-sl4-sport/p/115443
Cheers
Pretty sure your Specy BB is threaded on one side. Remove your cranks and check. If threaded the standard Praxis BB30 will work. https://praxiscycles.com/product/standard-bb/
If it's not threaded then you'll need this one. https://praxiscycles.com/product/shimano-conversion-bb/