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Thread for Specialized Sirrus

Old 10-11-21, 09:34 PM
  #1676  
bmwpowere36m3
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A 650B wheel/tire combo can have the same overall diameter as a 700c... so it "depends" on specific sizes. 650B is like high-profile tires vs. 700c low-profile of the gravel community.
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Old 10-12-21, 09:04 AM
  #1677  
dougpgreen
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Originally Posted by bmwpowere36m3 View Post
A 650B wheel/tire combo can have the same overall diameter as a 700c... so it "depends" on specific sizes. 650B is like high-profile tires vs. 700c low-profile of the gravel community.
This. Since the purpose of moving to 650b from 700c would normally be to get clearance to use larger tires, there coud be less difference on BB height with the right tires than one might think. It also depends on your riding style (how much do you typically lean?). If you ride singletrack trails with sharper curves, you will have more issues than if you ride gravel roads with curves designed for cars. The BB height on the 5.0 is not particularly high for an off-road bike, so it is something I woud pay attention to, It's very personal. Some might even be willing to deal with the possibility of pedal strike for the purpose of decreasing standover height. I've considered this for my wife as she seldom leans her bike far enough for pedal strike to come into play. In my experience, customer support at Specialized are not a reliable source of wisdom. They mostly answer questions with canned answers and don't go off script or deal with nuance. Sometimes you get lucky and get a response from someone that gives you useful information, but that happens about 1 of 5 interactions in my experience.
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Old 10-12-21, 10:08 AM
  #1678  
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Another thing you can do to decrease the chances of pedal strike, and this is likely more applicable to those looking for increased standover clearance anyway, is consider shorter crank arms. Most bikes today come with 170mm arms on small and medium sized frames and 172.5 or 175mm on the larger frames. Shorter 160 or 165mm crank arms could add 5-10mm to your pedal strike clearance...which could offset the clearance lost by going to the smaller wheel and tire combination. Going from a 32-622 (nominally 686mm diameter) to a 42-584 (668mm) or a 47-584 (678mm) means a loss of 8-18mm of diameter -- or 4-9mm in radius (frame height).
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Old 10-12-21, 12:32 PM
  #1679  
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Originally Posted by RH64 View Post
I've got a question for someone smarter than me! I recently contacted Specialized about 650B wheels on the Sirrus x 5.0 and they suggested not to because of the risk of pedal strikes.

Can someone tell me the difference in bottom bracket height on a 700c w/ 38mm tires vs a 650b with 47mm tires?

Thanks,
Robert
You aren't going to have any pedal strike issues unless you were to take the bike off road onto single track mountain bike trails. Gravel and paved roads will not be a problem with 650b tires.
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Old 10-12-21, 08:16 PM
  #1680  
bmwpowere36m3
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Anyone riding a Diverge? Thinking of adding a Diverge carbon comp to compliment the Sirrus... I'm finding on longer or quicker rides I'm holding the Ergon GP3 grips like hoods. Maybe throw 650Bs on x5.0 and make it more a "fun" bike and use the diverge for longer rides.
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Old 10-13-21, 11:31 AM
  #1681  
RH64
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Thank you all for the 650B thoughts.
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Old 10-14-21, 06:25 PM
  #1682  
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Rear Rack on Sirrus X 5.0

Since I did not get any replies, I decided to go ahead with my planned solution for a rear rack on my Sirrus X 5.0. Specialized sells one of their own with a special bar that connects from the rack to the rear fender mount, but I've already invested in Topeaks removable bag rack system and wanted to keep mine. The rack mounts near the dropouts are not like the traditional bolt holes. There is a small black pin that protrudes from the seat stay that is held in place by a retaining screw. It is placed so that my rack would have trouble fitting unless I moved the pin out so far that I would not trust it to stay retained, so instead I used some nylon spacers to keep the rack away from the stays. I bent a piece of aluminum stock to connect to the front of the rack to the fender mount and used a rubber washer to protect the frame. I won't load it up like I would have on my aluminu bike, but it will be fine for carrying around extra clothing during the winter for me and my wife.




Last edited by dougpgreen; 10-14-21 at 06:28 PM.
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