I ride a '95 Riv Road size 54.5 which is too tall for me in 700c. The long 
reach Tektro/Silver calipers do work with 650B wheels and I have only 
ridden it that way. It will take 38mm tires w/o fenders.  I know Joe said 
it won't help your Roadini, but if you can borrow a caliper and do a test 
fit, I would.  170 arms are not  too long and the bike rides great.  YMMV.

Bruce

On Wednesday, November 17, 2021 at 10:22:33 AM UTC-6 RichS wrote:

> Kushan:
>
> Keep in mind the bottom bracket will be lower so the likelihood of pedal 
> strike will be present when you lean the bike into a turn. Pedal selection 
> plays a part too; shorter cranks (165 / 160) would be a consideration to 
> help reduce pedal strike. This was my experience with a mid-80s Trek I 
> converted from 700 to 650b. Ultimately the bike felt better with the 700 
> wheel size. Good luck with your experiment if you pursue it. 
>
> Best,
> Rich in ATL
>
> On Wednesday, November 17, 2021 at 1:39:57 AM UTC-5 Kushan wrote:
>
>> Hi all -
>>
>> I currently own a 2020 Roadini (61 cm) with 38 mm slick tires. I have 
>> tried 32 mm and 35 mm in past but find 38 mm perfect in terms of comfort 
>> vs. speed trade off. I am planning to move to the land of daily rain 
>> (Seattle!!) in a near future and have been told that permanent fenders are 
>> a must have for getting any real use out of the bike. 
>>
>> The problem is that I don't want to use 32 mm tires (which is the 
>> advertised max clearance with fenders) for this frame. I am contemplating 
>> if conversion to 650b wheels will give me sufficient clearance for 38 mm 
>> tires with fender (smaller frame 650b Roadinis are known to clear upto 42 
>> mm). 
>>
>> My questions to the group are:
>> - Is this even an option or would the chain/seat stays and fork will 
>> simply not cover this much tire + fenders?
>> - Based on Rivendell 650b conversion guide, the conversion should be 
>> straightforward by switching to long reach caliper brakes and bottom 
>> bracket will have sufficient clearance for 170 mm cranks. However, I wanted 
>> to see if anyone has attempted this conversion before and what their 
>> experience was. 
>>
>> Best
>> Kushan
>>
>

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